test&doc: add example and update doc for datetime package

README.md

@@ -348,36 +348,99 @@ import "github.com/duke-git/lancet/v2/datetime"
 
 #### Function list:
 
--   [AddDay](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddDay)
+-   **<big>AddDay</big>** : add or sub day to the time.
--   [AddHour](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddDay)]
--   [AddMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddMinute)
+    [[play](https://go.dev/play/p/dIGbs_uTdFa)]
--   [BeginOfMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMinute)
+-   **<big>AddHour</big>** : add or sub day to the time.
--   [BeginOfHour](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddHour)]
--   [BeginOfDay](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfDay)
+    [[play](https://go.dev/play/p/rcMjd7OCsi5)]
--   [BeginOfWeek](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfWeek)
+-   **<big>AddMinute</big>** : add or sub day to the time.
--   [BeginOfMonth](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMonth)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#AddMinute)]
--   [BeginOfYear](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfYear)
+    [[play](https://go.dev/play/p/nT1heB1KUUK)]
--   [EndOfMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMinute)
+-   **<big>BeginOfMinute</big>** : return the date time at the begin of minute of specific date.
--   [EndOfHour](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMinute)]
--   [EndOfDay](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfDay)
+    [[play](https://go.dev/play/p/ieOLVJ9CiFT)]
--   [EndOfWeek](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfWeek)
+-   **<big>BeginOfHour</big>** : return the date time at the begin of hour of specific date.
--   [EndOfMonth](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMonth)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfHour)]
--   [EndOfYear](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfYear)
+    [[play](https://go.dev/play/p/GhdGFnDWpYs)]
--   [GetNowDate](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowDate)
+-   **<big>BeginOfDay</big>** : return the date time at the begin of day of specific date.
--   [GetNowTime](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowTime)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfDay)]
--   [GetNowDateTime](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowDateTime)
+    [[play](https://go.dev/play/p/94m_UT6cWs9)]
--   [GetZeroHourTimestamp](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetZeroHourTimestamp)
+-   **<big>BeginOfWeek</big>** : return the date time at the begin of week of specific date.
--   [GetNightTimestamp](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNightTimestamp)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfWeek)]
--   [FormatTimeToStr](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#FormatTimeToStr)
+    [[play](https://go.dev/play/p/ynjoJPz7VNV)]
--   [FormatStrToTime](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#FormatStrToTime)
+-   **<big>BeginOfMonth</big>** : return the date time at the begin of month of specific date.
--   [NewUnix](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewUnix)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMonth)]
--   [NewUnixNow](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewUnixNow)
+    [[play](https://go.dev/play/p/bWXVFsmmzwL)]
--   [NewFormat](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewFormat)
+-   **<big>BeginOfYear</big>** : return the date time at the begin of year of specific date.
--   [NewISO8601](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewISO8601)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfYear)]
--   [ToUnix](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToUnix)
+    [[play](https://go.dev/play/p/i326DSwLnV8)]
--   [ToFormat](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToFormat)
+-   **<big>EndOfMinute</big>** : return the date time at the end of minute of specific date.
--   [ToFormatForTpl](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToFormatForTpl)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMinute)]
--   [ToIso8601](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToIso8601)
+    [[play](https://go.dev/play/p/yrL5wGzPj4z)]
+-   **<big>EndOfHour</big>** : return the date time at the end of hour of specific date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfHour)]
+    [[play](https://go.dev/play/p/6ce3j_6cVqN)]
+-   **<big>EndOfDay</big>** : return the date time at the end of day of specific date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfDay)]
+    [[play](https://go.dev/play/p/eMBOvmq5Ih1)]
+-   **<big>EndOfWeek</big>** : return the date time at the end of week of specific date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfWeek)]
+    [[play](https://go.dev/play/p/i08qKXD9flf)]
+-   **<big>EndOfMonth</big>** : return the date time at the end of month of specific date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMonth)]
+    [[play](https://go.dev/play/p/_GWh10B3Nqi)]
+-   **<big>EndOfYear</big>** : return the date time at the end of year of specific date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfYear)]
+    [[play](https://go.dev/play/p/G01cKlMCvNm)]
+-   **<big>GetNowDate</big>** : return format yyyy-mm-dd of current date.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowDate)]
+    [[play](https://go.dev/play/p/PvfkPpcpBBf)]
+-   **<big>GetNowTime</big>** : return format hh-mm-ss of current time.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowTime)]
+    [[play](https://go.dev/play/p/l7BNxCkTmJS)]
+-   **<big>GetNowDateTime</big>** : return format yyyy-mm-dd hh-mm-ss of current datetime.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNowDateTime)]
+    [[play](https://go.dev/play/p/pI4AqngD0al)]
+-   **<big>GetZeroHourTimestamp</big>** : return timestamp of zero hour (timestamp of 00:00).
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetZeroHourTimestamp)]
+    [[play](https://go.dev/play/p/QmL2oIaGE3q)]
+-   **<big>GetNightTimestamp</big>** : return timestamp of zero hour (timestamp of 23:59).
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#GetNightTimestamp)]
+    [[play](https://go.dev/play/p/UolysR3MYP1)]
+-   **<big>FormatTimeToStr</big>** : convert time to string.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#FormatTimeToStr)]
+    [[play](https://go.dev/play/p/_Ia7M8H_OvE)]
+-   **<big>FormatStrToTime</big>** : convert string to time.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#FormatStrToTime)]
+    [[play](https://go.dev/play/p/1h9FwdU8ql4)]
+-   **<big>NewUnix</big>** : return unix timestamp of specific time.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewUnix)]
+    [[play](https://go.dev/play/p/psoSuh_kLRt)]
+-   **<big>NewUnixNow</big>** : return unix timestamp of current time.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewUnixNow)]
+    [[play](https://go.dev/play/p/U4PPx-9D0oz)]
+-   **<big>NewFormat</big>** : return unix timestamp of specific time string, t should be "yyyy-mm-dd hh:mm:ss".
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewFormat)]
+    [[play](https://go.dev/play/p/VkW08ZOaXPZ)]
+-   **<big>NewISO8601</big>** : return unix timestamp of specific iso8601 time string.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#NewISO8601)]
+    [[play](https://go.dev/play/p/mkhOHQkdeA2)]
+-   **<big>ToUnix</big>** : return unix timestamp.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToUnix)]
+    [[play](https://go.dev/play/p/_LUiwAdocjy)]
+-   **<big>ToFormat</big>** : return the time string 'yyyy-mm-dd hh:mm:ss' of unix time.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToFormat)]
+    [[play](https://go.dev/play/p/VkW08ZOaXPZ)]
+-   **<big>ToFormatForTpl</big>** : return the time string which format is specific tpl.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToFormatForTpl)]
+    [[play](https://go.dev/play/p/nyXxXcQJ8L5)]
+-   **<big>ToIso8601</big>** : return iso8601 time string.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#ToIso8601)]
+    [[play](https://go.dev/play/p/mkhOHQkdeA2)]
+
+
+
 
 ### 7. Datastructure package constains some common data structure. eg. list, linklist, stack, queue, set, tree, graph.
 
@@ -666,7 +729,7 @@ import "github.com/duke-git/lancet/v2/random"
 -   **<big>RandInt</big>** : generate random int number between min and max.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandInt)]
     [[play](https://go.dev/play/p/pXyyAAI5YxD)]
--   **<big>RandString</big>** : generate random string of specified length.
+-   **<big>RandString</big>** : generate random string of specific length.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandString)]
     [[play](https://go.dev/play/p/W2xvRUXA7Mi)]
 -   **<big>RandUpper</big>** : generate a random upper case string.
@@ -675,7 +738,7 @@ import "github.com/duke-git/lancet/v2/random"
 -   **<big>RandLower</big>** : generate a random lower case string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandLower)]
     [[play](https://go.dev/play/p/XJtZ471cmtI)]
--   **<big>RandNumeral</big>** : generate a random numeral string of specified length.
+-   **<big>RandNumeral</big>** : generate a random numeral string of specific length.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandNumeral)]
     [[play](https://go.dev/play/p/g4JWVpHsJcf)]
 -   **<big>RandNumeralOrLetter</big>** : generate a random numeral or letter string.
@@ -885,15 +948,15 @@ import "github.com/duke-git/lancet/v2/strutil"
 
 #### Function list:
 
--   **<big>After</big>** : returns the substring after the first occurrence of a specified string in the source string.
+-   **<big>After</big>** : returns the substring after the first occurrence of a specific string in the source string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#After)]
     [[play](https://go.dev/play/p/RbCOQqCDA7m)]
--   **<big>AfterLast</big>** : returns the substring after the last occurrence of a specified string in the source string. [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#AfterLast)]
+-   **<big>AfterLast</big>** : returns the substring after the last occurrence of a specific string in the source string. [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#AfterLast)]
     [[play](https://go.dev/play/p/1TegARrb8Yn)]
--   **<big>Before</big>** : returns the substring before the first occurrence of a specified string in the source string.
+-   **<big>Before</big>** : returns the substring before the first occurrence of a specific string in the source string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#Before)]
     [[play](https://go.dev/play/p/JAWTZDS4F5w)]
--   **<big>BeforeLast</big>** : returns the substring before the last occurrence of a specified string in the source string.
+-   **<big>BeforeLast</big>** : returns the substring before the last occurrence of a specific string in the source string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#BeforeLast)]
     [[play](https://go.dev/play/p/pJfXXAoG_Te)]
 -   **<big>CamelCase</big>** : coverts source string to its camelCase string.
@@ -935,7 +998,7 @@ import "github.com/duke-git/lancet/v2/strutil"
 -   **<big>SplitEx</big>** : split a given string which can control the result slice contains empty string or not.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#SplitEx)]
     [[play](https://go.dev/play/p/Us-ySSbWh-3)]
--   **<big>Substring</big>** : returns a substring of the specified length starting at the specified offset position.
+-   **<big>Substring</big>** : returns a substring of the specific length starting at the specific offset position.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#Substring)]
 -   **<big>Wrap</big>** : wrap a string with given string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#Wrap)]

README_zh-CN.md

@@ -349,36 +349,98 @@ import "github.com/duke-git/lancet/v2/datetime"
 
 #### 函数列表:
 
--   [AddDay](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddDay)
+-   **<big>AddDay</big>** : 将日期加/减天数。
--   [AddHour](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddDay)]
--   [AddMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddMinute)
+    [[play](https://go.dev/play/p/dIGbs_uTdFa)]
--   [BeginOfMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMinute)
+-   **<big>AddHour</big>** : 将日期加/减小时数。
--   [BeginOfHour](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddHour)]
--   [BeginOfDay](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfDay)
+    [[play](https://go.dev/play/p/rcMjd7OCsi5)]
--   [BeginOfWeek](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfWeek)
+-   **<big>AddMinute</big>** : 将日期加/减分钟数。
--   [BeginOfMonth](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfMonth)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#AddMinute)]
--   [BeginOfYear](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#BeginOfYear)
+    [[play](https://go.dev/play/p/nT1heB1KUUK)]
--   [EndOfMinute](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMinute)
+-   **<big>BeginOfMinute</big>** : 返回指定时间的分钟开始时间。
--   [EndOfHour](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfHour)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfMinute)]
--   [EndOfDay](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfDay)
+    [[play](https://go.dev/play/p/ieOLVJ9CiFT)]
--   [EndOfWeek](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfWeek)
+-   **<big>BeginOfHour</big>** : 返回指定时间的小时开始时间。
--   [EndOfMonth](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfMonth)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfHour)]
--   [EndOfYear](https://github.com/duke-git/lancet/blob/main/docs/datetime.md#EndOfYear)
+    [[play](https://go.dev/play/p/GhdGFnDWpYs)]
--   [GetNowDate](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowDate)
+-   **<big>BeginOfDay</big>** : 返回指定时间的当天开始时间。
--   [GetNowTime](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowTime)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfDay)]
--   [GetNowDateTime](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowDateTime)
+    [[play](https://go.dev/play/p/94m_UT6cWs9)]
--   [GetZeroHourTimestamp](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetZeroHourTimestamp)
+-   **<big>BeginOfWeek</big>** : 返回指定时间的每周开始时间,默认开始时间星期日。
--   [GetNightTimestamp](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNightTimestamp)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfWeek)]
--   [FormatTimeToStr](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#FormatTimeToStr)
+    [[play](https://go.dev/play/p/ynjoJPz7VNV)]
--   [FormatStrToTime](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#FormatStrToTime)
+-   **<big>BeginOfMonth</big>** : 返回指定时间的当月开始时间。
--   [NewUnix](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewUnix)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfMonth)]
--   [NewUnixNow](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewUnixNow)
+    [[play](https://go.dev/play/p/bWXVFsmmzwL)]
--   [NewFormat](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewFormat)
+-   **<big>BeginOfYear</big>** : 返回指定时间的当年开始时间。
--   [NewISO8601](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewISO8601)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#BeginOfYear)]
--   [ToUnix](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToUnix)
+    [[play](https://go.dev/play/p/i326DSwLnV8)]
--   [ToFormat](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToFormat)
+-   **<big>EndOfMinute</big>** : 返回指定时间的分钟结束时间。
--   [ToFormatForTpl](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToFormatForTpl)
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfMinute)]
--   [ToIso8601](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToIso8601)
+    [[play](https://go.dev/play/p/yrL5wGzPj4z)]
+-   **<big>EndOfHour</big>** : 返回指定时间的小时结束时间。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfHour)]
+    [[play](https://go.dev/play/p/6ce3j_6cVqN)]
+-   **<big>EndOfDay</big>** : 返回指定时间的当天结束时间。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfDay)]
+    [[play](https://go.dev/play/p/eMBOvmq5Ih1)]
+-   **<big>EndOfWeek</big>** : 返回指定时间的星期结束时间,默认结束时间星期六。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfWeek)]
+    [[play](https://go.dev/play/p/i08qKXD9flf)]
+-   **<big>EndOfMonth</big>** : 返回指定时间的月份结束时间。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfMonth)]
+    [[play](https://go.dev/play/p/_GWh10B3Nqi)]
+-   **<big>EndOfYear</big>** : 返回指定时间的年份结束时间。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#EndOfYear)]
+    [[play](https://go.dev/play/p/G01cKlMCvNm)]
+-   **<big>GetNowDate</big>** : 获取当天日期，返回格式：yyyy-mm-dd。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowDate)]
+    [[play](https://go.dev/play/p/PvfkPpcpBBf)]
+-   **<big>GetNowTime</big>** : 获取当时时间，返回格式：hh:mm:ss。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowTime)]
+    [[play](https://go.dev/play/p/l7BNxCkTmJS)]
+-   **<big>GetNowDateTime</big>** : 获取当时日期和时间，返回格式：yyyy-mm-dd hh:mm:ss。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNowDateTime)]
+    [[play](https://go.dev/play/p/pI4AqngD0al)]
+-   **<big>GetZeroHourTimestamp</big>** : 获取零时时间戳(timestamp of 00:00)。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetZeroHourTimestamp)]
+    [[play](https://go.dev/play/p/QmL2oIaGE3q)]
+-   **<big>GetNightTimestamp</big>** : 获取午夜时间戳(timestamp of 23:59)。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#GetNightTimestamp)]
+    [[play](https://go.dev/play/p/UolysR3MYP1)]
+-   **<big>FormatTimeToStr</big>** : 将日期格式化成字符串。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#FormatTimeToStr)]
+    [[play](https://go.dev/play/p/_Ia7M8H_OvE)]
+-   **<big>FormatStrToTime</big>** : 将字符串格式化成时间。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#FormatStrToTime)]
+    [[play](https://go.dev/play/p/1h9FwdU8ql4)]
+-   **<big>NewUnix</big>** : 创建一个unix时间戳。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewUnix)]
+    [[play](https://go.dev/play/p/psoSuh_kLRt)]
+-   **<big>NewUnixNow</big>** : 创建一个当前时间的unix时间戳。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewUnixNow)]
+    [[play](https://go.dev/play/p/U4PPx-9D0oz)]
+-   **<big>NewFormat</big>** : 创建一个yyyy-mm-dd hh:mm:ss格式时间字符串的unix时间戳。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewFormat)]
+    [[play](https://go.dev/play/p/VkW08ZOaXPZ)]
+-   **<big>NewISO8601</big>** : 创建一个iso8601格式时间字符串的unix时间戳。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#NewISO8601)]
+    [[play](https://go.dev/play/p/mkhOHQkdeA2)]
+-   **<big>ToUnix</big>** : 返回unix时间戳。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToUnix)]
+    [[play](https://go.dev/play/p/_LUiwAdocjy)]
+-   **<big>ToFormat</big>** : 返回格式'yyyy-mm-dd hh:mm:ss'的日期字符串。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToFormat)]
+    [[play](https://go.dev/play/p/VkW08ZOaXPZ)]
+-   **<big>ToFormatForTpl</big>** : 返回tpl格式指定的日期字符串。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToFormatForTpl)]
+    [[play](https://go.dev/play/p/nyXxXcQJ8L5)]
+-   **<big>ToIso8601</big>** : 返回iso8601日期字符串。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/datetime_zh-CN.md#ToIso8601)]
+    [[play](https://go.dev/play/p/mkhOHQkdeA2)]
+    
+
 
 ### 7. datastructure 包含一些普通的数据结构实现。例如：list, linklist, stack, queue, set, tree, graph.
 

datetime/conversion.go

@@ -9,17 +9,20 @@ type theTime struct {
 	unix int64
 }
 
-// NewUnixNow return unix timestamp of current time
+// NewUnixNow return unix timestamp of current time.
+// Play: https://go.dev/play/p/U4PPx-9D0oz
 func NewUnixNow() *theTime {
 	return &theTime{unix: time.Now().Unix()}
 }
 
-// NewUnix return unix timestamp of specified time
+// NewUnix return unix timestamp of specified time.
+// Play: https://go.dev/play/p/psoSuh_kLRt
 func NewUnix(unix int64) *theTime {
 	return &theTime{unix: unix}
 }
 
-// NewFormat return unix timestamp of specified time string, t should be "yyyy-mm-dd hh:mm:ss"
+// NewFormat return unix timestamp of specified time string, t should be "yyyy-mm-dd hh:mm:ss".
+// Play: https://go.dev/play/p/VkW08ZOaXPZ
 func NewFormat(t string) (*theTime, error) {
 	timeLayout := "2006-01-02 15:04:05"
 	loc := time.FixedZone("CST", 8*3600)
@@ -30,7 +33,8 @@ func NewFormat(t string) (*theTime, error) {
 	return &theTime{unix: tt.Unix()}, nil
 }
 
-// NewISO8601 return unix timestamp of specified iso8601 time string
+// NewISO8601 return unix timestamp of specified iso8601 time string.
+// Play: https://go.dev/play/p/mkhOHQkdeA2
 func NewISO8601(iso8601 string) (*theTime, error) {
 	t, err := time.ParseInLocation(time.RFC3339, iso8601, time.UTC)
 	if err != nil {
@@ -39,22 +43,26 @@ func NewISO8601(iso8601 string) (*theTime, error) {
 	return &theTime{unix: t.Unix()}, nil
 }
 
-// ToUnix return unix timestamp
+// ToUnix return unix timestamp.
+// Play: https://go.dev/play/p/_LUiwAdocjy
 func (t *theTime) ToUnix() int64 {
 	return t.unix
 }
 
-// ToFormat return the time string 'yyyy-mm-dd hh:mm:ss' of unix time
+// ToFormat return the time string 'yyyy-mm-dd hh:mm:ss' of unix time.
+// Play: https://go.dev/play/p/VkW08ZOaXPZ
 func (t *theTime) ToFormat() string {
 	return time.Unix(t.unix, 0).Format("2006-01-02 15:04:05")
 }
 
-// ToFormatForTpl return the time string which format is specified tpl
+// ToFormatForTpl return the time string which format is specified tpl.
+// Play: https://go.dev/play/p/nyXxXcQJ8L5
 func (t *theTime) ToFormatForTpl(tpl string) string {
 	return time.Unix(t.unix, 0).Format(tpl)
 }
 
-// ToFormatForTpl return iso8601 time string
+// ToFormatForTpl return iso8601 time string.
+// Play: https://go.dev/play/p/mkhOHQkdeA2
 func (t *theTime) ToIso8601() string {
 	return time.Unix(t.unix, 0).Format(time.RFC3339)
 }

datetime/conversion_test.go

@@ -19,9 +19,6 @@ func TestToUnix(t *testing.T) {
 func TestToFormat(t *testing.T) {
 	assert := internal.NewAssert(t, "TestToFormat")
 
-	_, err := NewFormat("2022/03/18 17:04:05")
-	assert.IsNotNil(err)
-
 	tm, err := NewFormat("2022-03-18 17:04:05")
 	assert.IsNil(err)
 

datetime/datetime.go

@@ -54,54 +54,64 @@ func init() {
 	}
 }
 
-// AddMinute add or sub minute to the time
+// AddMinute add or sub minute to the time.
+// Play: https://go.dev/play/p/nT1heB1KUUK
 func AddMinute(t time.Time, minute int64) time.Time {
 	return t.Add(time.Minute * time.Duration(minute))
 }
 
-// AddHour add or sub hour to the time
+// AddHour add or sub hour to the time.
+// Play: https://go.dev/play/p/rcMjd7OCsi5
 func AddHour(t time.Time, hour int64) time.Time {
 	return t.Add(time.Hour * time.Duration(hour))
 }
 
-// AddDay add or sub day to the time
+// AddDay add or sub day to the time.
+// Play: https://go.dev/play/p/dIGbs_uTdFa
 func AddDay(t time.Time, day int64) time.Time {
 	return t.Add(24 * time.Hour * time.Duration(day))
 }
 
-// GetNowDate return format yyyy-mm-dd of current date
+// GetNowDate return format yyyy-mm-dd of current date.
+// Play: https://go.dev/play/p/PvfkPpcpBBf
 func GetNowDate() string {
 	return time.Now().Format("2006-01-02")
 }
 
-// GetNowTime return format hh-mm-ss of current time
+// GetNowTime return format hh-mm-ss of current time.
+// Play: https://go.dev/play/p/l7BNxCkTmJS
 func GetNowTime() string {
 	return time.Now().Format("15:04:05")
 }
 
-// GetNowDateTime return format yyyy-mm-dd hh-mm-ss of current datetime
+// GetNowDateTime return format yyyy-mm-dd hh-mm-ss of current datetime.
+// Play: https://go.dev/play/p/pI4AqngD0al
 func GetNowDateTime() string {
 	return time.Now().Format("2006-01-02 15:04:05")
 }
 
-// GetZeroHourTimestamp return timestamp of zero hour (timestamp of 00:00)
+// GetZeroHourTimestamp return timestamp of zero hour (timestamp of 00:00).
+// Play: https://go.dev/play/p/QmL2oIaGE3q
 func GetZeroHourTimestamp() int64 {
 	ts := time.Now().Format("2006-01-02")
 	t, _ := time.Parse("2006-01-02", ts)
 	return t.UTC().Unix() - 8*3600
 }
 
-// GetNightTimestamp return timestamp of zero hour (timestamp of 23:59)
+// GetNightTimestamp return timestamp of zero hour (timestamp of 23:59).
+// Play: https://go.dev/play/p/UolysR3MYP1
 func GetNightTimestamp() int64 {
 	return GetZeroHourTimestamp() + 86400 - 1
 }
 
-// FormatTimeToStr convert time to string
+// FormatTimeToStr convert time to string.
+// Play: https://go.dev/play/p/_Ia7M8H_OvE
 func FormatTimeToStr(t time.Time, format string) string {
 	return t.Format(timeFormat[format])
 }
 
-// FormatStrToTime convert string to time
+// FormatStrToTime convert string to time.
+// Play: https://go.dev/play/p/1h9FwdU8ql4
 func FormatStrToTime(str, format string) (time.Time, error) {
 	v, ok := timeFormat[format]
 	if !ok {
@@ -111,43 +121,50 @@ func FormatStrToTime(str, format string) (time.Time, error) {
 	return time.Parse(v, str)
 }
 
-// BeginOfMinute return beginning minute time of day
+// BeginOfMinute return beginning minute time of day.
+// Play: https://go.dev/play/p/ieOLVJ9CiFT
 func BeginOfMinute(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, t.Hour(), t.Minute(), 0, 0, t.Location())
 }
 
-// EndOfMinute return end minute time of day
+// EndOfMinute return end minute time of day.
+// Play: https://go.dev/play/p/yrL5wGzPj4z
 func EndOfMinute(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, t.Hour(), t.Minute(), 59, int(time.Second-time.Nanosecond), t.Location())
 }
 
-// BeginOfHour return beginning hour time of day
+// BeginOfHour return beginning hour time of day.
+// Play: https://go.dev/play/p/GhdGFnDWpYs
 func BeginOfHour(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, t.Hour(), 0, 0, 0, t.Location())
 }
 
-// EndOfHour return end hour time of day
+// EndOfHour return end hour time of day.
+// Play: https://go.dev/play/p/6ce3j_6cVqN
 func EndOfHour(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, t.Hour(), 59, 59, int(time.Second-time.Nanosecond), t.Location())
 }
 
-// BeginOfDay return beginning hour time of day
+// BeginOfDay return beginning hour time of day.
+// Play: https://go.dev/play/p/94m_UT6cWs9
 func BeginOfDay(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, 0, 0, 0, 0, t.Location())
 }
 
-// EndOfDay return end time of day
+// EndOfDay return end time of day.
+// Play: https://go.dev/play/p/eMBOvmq5Ih1
 func EndOfDay(t time.Time) time.Time {
 	y, m, d := t.Date()
 	return time.Date(y, m, d, 23, 59, 59, int(time.Second-time.Nanosecond), t.Location())
 }
 
-// BeginOfWeek return beginning week, default week begin from Sunday
+// BeginOfWeek return beginning week, default week begin from Sunday.
+// Play: https://go.dev/play/p/ynjoJPz7VNV
 func BeginOfWeek(t time.Time, beginFrom ...time.Weekday) time.Time {
 	var beginFromWeekday = time.Sunday
 	if len(beginFrom) > 0 {
@@ -161,7 +178,8 @@ func BeginOfWeek(t time.Time, beginFrom ...time.Weekday) time.Time {
 	return beginOfWeek
 }
 
-// EndOfWeek return end week time, default week end with Saturday
+// EndOfWeek return end week time, default week end with Saturday.
+// Play: https://go.dev/play/p/i08qKXD9flf
 func EndOfWeek(t time.Time, endWith ...time.Weekday) time.Time {
 	var endWithWeekday = time.Saturday
 	if len(endWith) > 0 {
@@ -175,24 +193,28 @@ func EndOfWeek(t time.Time, endWith ...time.Weekday) time.Time {
 	return endWithWeek
 }
 
-// BeginOfMonth return beginning of month
+// BeginOfMonth return beginning of month.
+// Play: https://go.dev/play/p/bWXVFsmmzwL
 func BeginOfMonth(t time.Time) time.Time {
 	y, m, _ := t.Date()
 	return time.Date(y, m, 1, 0, 0, 0, 0, t.Location())
 }
 
-// EndOfMonth return end of month
+// EndOfMonth return end of month.
+// Play: https://go.dev/play/p/_GWh10B3Nqi
 func EndOfMonth(t time.Time) time.Time {
 	return BeginOfMonth(t).AddDate(0, 1, 0).Add(-time.Nanosecond)
 }
 
-// BeginOfYear return beginning of year
+// BeginOfYear return the date time at the begin of year.
+// Play: https://go.dev/play/p/i326DSwLnV8
 func BeginOfYear(t time.Time) time.Time {
 	y, _, _ := t.Date()
 	return time.Date(y, time.January, 1, 0, 0, 0, 0, t.Location())
 }
 
-// EndOfYear return end of year
+// EndOfYear return the date time at the end of year.
+// Play: https://go.dev/play/p/G01cKlMCvNm
 func EndOfYear(t time.Time) time.Time {
 	return BeginOfYear(t).AddDate(1, 0, 0).Add(-time.Nanosecond)
 }

datetime/datetime_example_test.go

@@ -0,0 +1,323 @@
+package datetime
+
+import (
+	"fmt"
+	"reflect"
+	"time"
+)
+
+func ExampleAddDay() {
+	now := time.Now()
+
+	tomorrow := AddDay(now, 1)
+	diff1 := tomorrow.Sub(now)
+
+	yesterday := AddDay(now, -1)
+	diff2 := yesterday.Sub(now)
+
+	fmt.Println(diff1)
+	fmt.Println(diff2)
+
+	// Output:
+	// 24h0m0s
+	// -24h0m0s
+}
+
+func ExampleAddHour() {
+	now := time.Now()
+
+	after2Hours := AddHour(now, 2)
+	diff1 := after2Hours.Sub(now)
+
+	before2Hours := AddHour(now, -2)
+	diff2 := before2Hours.Sub(now)
+
+	fmt.Println(diff1)
+	fmt.Println(diff2)
+
+	// Output:
+	// 2h0m0s
+	// -2h0m0s
+}
+
+func ExampleAddMinute() {
+	now := time.Now()
+
+	after2Minutes := AddMinute(now, 2)
+	diff1 := after2Minutes.Sub(now)
+
+	before2Minutes := AddMinute(now, -2)
+	diff2 := before2Minutes.Sub(now)
+
+	fmt.Println(diff1)
+	fmt.Println(diff2)
+
+	// Output:
+	// 2m0s
+	// -2m0s
+}
+
+func ExampleGetNowDate() {
+	result := GetNowDate()
+
+	expected := time.Now().Format("2006-01-02")
+
+	fmt.Println(result == expected)
+
+	// Output:
+	// true
+}
+
+func ExampleGetNowTime() {
+	result := GetNowTime()
+
+	expected := time.Now().Format("15:04:05")
+
+	fmt.Println(result == expected)
+
+	// Output:
+	// true
+}
+
+func ExampleGetNowDateTime() {
+	result := GetNowDateTime()
+
+	expected := time.Now().Format("2006-01-02 15:04:05")
+
+	fmt.Println(result == expected)
+
+	// Output:
+	// true
+}
+
+// func ExampleGetZeroHourTimestamp() {
+// 	ts := GetZeroHourTimestamp()
+
+// 	fmt.Println(ts)
+
+// 	// Output:
+// 	// 1673107200
+// }
+
+// func ExampleGetNightTimestamp() {
+// 	ts := GetNightTimestamp()
+
+// 	fmt.Println(ts)
+
+// 	// Output:
+// 	// 1673193599
+// }
+
+func ExampleFormatTimeToStr() {
+	datetime, _ := time.Parse("2006-01-02 15:04:05", "2021-01-02 16:04:08")
+
+	result1 := FormatTimeToStr(datetime, "yyyy-mm-dd hh:mm:ss")
+	result2 := FormatTimeToStr(datetime, "yyyy-mm-dd")
+	result3 := FormatTimeToStr(datetime, "dd-mm-yy hh:mm:ss")
+
+	fmt.Println(result1)
+	fmt.Println(result2)
+	fmt.Println(result3)
+
+	// Output:
+	// 2021-01-02 16:04:08
+	// 2021-01-02
+	// 02-01-21 16:04:08
+}
+
+func ExampleFormatStrToTime() {
+	result1, _ := FormatStrToTime("2021-01-02 16:04:08", "yyyy-mm-dd hh:mm:ss")
+	result2, _ := FormatStrToTime("2021-01-02", "yyyy-mm-dd")
+	result3, _ := FormatStrToTime("02-01-21 16:04:08", "dd-mm-yy hh:mm:ss")
+
+	fmt.Println(result1)
+	fmt.Println(result2)
+	fmt.Println(result3)
+
+	// Output:
+	// 2021-01-02 16:04:08 +0000 UTC
+	// 2021-01-02 00:00:00 +0000 UTC
+	// 2021-01-02 16:04:08 +0000 UTC
+}
+
+func ExampleBeginOfMinute() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfMinute(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 18:50:00 +0800 CST
+}
+
+func ExampleEndOfMinute() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfMinute(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 18:50:59.999999999 +0800 CST
+}
+
+func ExampleBeginOfHour() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfHour(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 18:00:00 +0800 CST
+}
+
+func ExampleEndOfHour() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfHour(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 18:59:59.999999999 +0800 CST
+}
+
+func ExampleBeginOfDay() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfDay(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 00:00:00 +0800 CST
+}
+
+func ExampleEndOfDay() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfDay(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 23:59:59.999999999 +0800 CST
+}
+
+func ExampleBeginOfWeek() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfWeek(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-08 00:00:00 +0800 CST
+}
+
+func ExampleEndOfWeek() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfWeek(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-14 23:59:59.999999999 +0800 CST
+}
+
+func ExampleBeginOfMonth() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfMonth(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-01 00:00:00 +0800 CST
+}
+
+func ExampleEndOfMonth() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfMonth(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-31 23:59:59.999999999 +0800 CST
+}
+
+func ExampleBeginOfYear() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := BeginOfYear(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-01-01 00:00:00 +0800 CST
+}
+
+func ExampleEndOfYear() {
+	input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.Local)
+
+	result := EndOfYear(input)
+
+	fmt.Println(result)
+
+	// Output:
+	// 2023-12-31 23:59:59.999999999 +0800 CST
+}
+
+func ExampleNewUnix() {
+	result := NewUnix(1647597438)
+
+	fmt.Println(result)
+
+	// Output:
+	// &{1647597438}
+}
+
+func ExampleNewUnixNow() {
+	tm1 := NewUnixNow()
+
+	unixTimestamp := tm1.ToUnix()
+
+	tm2 := NewUnix(unixTimestamp)
+
+	fmt.Println(reflect.DeepEqual(tm1, tm2))
+
+	// Output:
+	// true
+}
+
+func ExampleNewFormat() {
+	tm, err := NewFormat("2022-03-18 17:04:05")
+	if err != nil {
+		return
+	}
+
+	result := tm.ToFormat()
+
+	fmt.Println(result)
+
+	// Output:
+	// 2022-03-18 17:04:05
+}
+
+func ExampleNewISO8601() {
+	tm, err := NewISO8601("2006-01-02T15:04:05.999Z")
+	if err != nil {
+		return
+	}
+
+	result := tm.ToIso8601()
+
+	fmt.Println(result)
+
+	// Output:
+	// 2006-01-02T23:04:05+08:00
+}

datetime/datetime_test.go

@@ -52,8 +52,8 @@ func TestGetNowDate(t *testing.T) {
 	assert.Equal(expected, GetNowDate())
 }
 
-func TestGetNotTime(t *testing.T) {
+func TestGetNowTime(t *testing.T) {
-	assert := internal.NewAssert(t, "TestGetNotTime")
+	assert := internal.NewAssert(t, "TestGetNowTime")
 	expected := time.Now().Format("15:04:05")
 	assert.Equal(expected, GetNowTime())
 }
@@ -81,7 +81,6 @@ func TestFormatTimeToStr(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		actual := FormatTimeToStr(datetime, cases[i])
 		assert.Equal(expected[i], actual)
-
 	}
 }
 

docs/datetime_zh-CN.md

@@ -377,7 +377,7 @@ func main() {
 ```
 
 ### <span id="EndOfDay">EndOfDay</span>
-<p>返回指定时间的当天结束时间.</p>
+<p>返回指定时间的当天结束时间</p>
 
 <b>函数签名:</b>
 
@@ -541,7 +541,7 @@ func main() {
 
 
 ### <span id="GetNowDateTime">GetNowDateTime</span>
-<p>获取当时日期和时间，返回格式：yyyy-mm-dd hh:mm:ss.</p>
+<p>获取当时日期和时间，返回格式：yyyy-mm-dd hh:mm:ss</p>
 
 <b>函数签名:</b>
 
@@ -568,7 +568,7 @@ func main() {
 
 
 ### <span id="GetZeroHourTimestamp">GetZeroHourTimestamp</span>
-<p>获取零时时间戳(timestamp of 00:00).</p>
+<p>获取零时时间戳(timestamp of 00:00)</p>
 
 <b>函数签名:</b>
 
@@ -595,7 +595,7 @@ func main() {
 
 
 ### <span id="GetNightTimestamp">GetNightTimestamp</span>
-<p>获取午夜时间戳(timestamp of 23:59).</p>
+<p>获取午夜时间戳(timestamp of 23:59)</p>
 
 <b>函数签名:</b>