feat:add betweenSeconds func (#102)

Co-authored-by: leitao <leitao@kezaihui.com>

datetime/datetime.go

@@ -230,3 +230,8 @@ func EndOfYear(t time.Time) time.Time {
 func IsLeapYear(year int) bool {
 	return year%4 == 0 && (year%100 != 0 || year%400 == 0)
 }
+
+func BetweenSeconds(t1 time.Time, t2 time.Time) int64 {
+	index := t2.Unix() - t1.Unix()
+	return index
+}

datetime/datetime_example_test.go

@@ -353,3 +353,18 @@ func ExampleIsLeapYear() {
 	// true
 	// false
 }
+
+func ExampleBetweenSeconds() {
+	now := time.Now()
+	target := AddDay(now, 1)
+
+	now1 := time.Now()
+	target1 := AddDay(now, -1)
+
+	fmt.Println(BetweenSeconds(now, target))
+	fmt.Println(BetweenSeconds(now1, target1))
+
+	// Output:
+	// 86400
+	// -86400
+}

datetime/datetime_test.go

@@ -1,6 +1,7 @@
 package datetime
 
 import (
+	"fmt"
 	"testing"
 	"time"
 
@@ -20,6 +21,12 @@ func TestAddYear(t *testing.T) {
 	assert.Equal(float64(-8760), diff2.Hours())
 }
 
+func TestBetweenSeconds(t *testing.T) {
+	now := time.Now()
+	target := AddDay(now, 1)
+	fmt.Println(BetweenSeconds(now, target))
+}
+
 func TestAddDay(t *testing.T) {
 	assert := internal.NewAssert(t, "TestAddDay")