获取上个月开始时间

utils/time.go

@@ -59,3 +59,10 @@ func AddDate(t time.Time, years int, months int) time.Time {
 func DayRemainSecond(date time.Time) int64 {
 	return time.Date(date.Year(), date.Month(), date.Day(), 23, 59, 59, 999, date.Location()).Unix() - date.Unix()
 }
+
+func GetLastMonthStart(t time.Time) time.Time {
+	thisMonthStart := time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
+	lastDay := thisMonthStart.AddDate(0, 0, -1)
+	lastMonthStart := time.Date(lastDay.Year(), lastDay.Month(), 1, 0, 0, 0, 0, t.Location())
+	return lastMonthStart
+}