diff --git a/time/consts.go b/time/consts.go
new file mode 100644
index 0000000..68dc3ed
--- /dev/null
+++ b/time/consts.go
@@ -0,0 +1,9 @@
+package util
+
+const (
+	DateLayout  = "2006-01-02"
+	ClockLayout = "15:04:05"
+	TimeLayout  = DateLayout + " " + ClockLayout
+
+	DefaultTimeLocationName = "Asia/Shanghai"
+)
diff --git a/time/diff.go b/time/diff.go
new file mode 100644
index 0000000..3d2e1f0
--- /dev/null
+++ b/time/diff.go
@@ -0,0 +1,61 @@
+package util
+
+import (
+	"math"
+	"time"
+)
+
+// DayDifferenceHours 两天之间相差了多少小时
+func DayDifferenceHours(startDate, endDate string) float64 {
+	startTime, _ := time.Parse(DateLayout, startDate)
+	endTime, _ := time.Parse(DateLayout, endDate)
+
+	duration := endTime.Sub(startTime)
+
+	return duration.Hours()
+}
+
+// StringDifferenceDays 两天之间相差了多少天
+func StringDifferenceDays(startDate, endDate string) int {
+	hours := DayDifferenceHours(startDate, endDate)
+	if hours == 0 {
+		return 0
+	}
+	return int(math.Ceil(hours / 24))
+}
+
+func DayTimeDifferenceHours(startDate, endDate time.Time) float64 {
+	startTime := time.Date(startDate.Year(), startDate.Month(), startDate.Day(), 0, 0, 0, 0, time.Local)
+	endTime := time.Date(endDate.Year(), endDate.Month(), endDate.Day(), 0, 0, 0, 0, time.Local)
+
+	duration := endTime.Sub(startTime)
+
+	return duration.Hours()
+}
+
+// TimeDifferenceDays 两天之间相差了多少天
+func TimeDifferenceDays(startDate, endDate time.Time) int {
+	hours := DayTimeDifferenceHours(startDate, endDate)
+	if hours == 0 {
+		return 0
+	}
+	return int(math.Ceil(hours / 24))
+}
+
+func DaySecondsDifferenceHours(startSecond, endSecond int64) float64 {
+	startTime := time.Unix(startSecond, 0)
+	endTime := time.Unix(endSecond, 0)
+
+	duration := endTime.Sub(startTime)
+
+	return duration.Hours()
+}
+
+// SecondsDifferenceDays 两天之间相差了多少天
+func SecondsDifferenceDays(startSecond, endSecond int64) int {
+	hours := DaySecondsDifferenceHours(startSecond, endSecond)
+	if hours == 0 {
+		return 0
+	}
+	return int(math.Ceil(hours / 24))
+}
diff --git a/time/diff_test.go b/time/diff_test.go
new file mode 100644
index 0000000..0f69738
--- /dev/null
+++ b/time/diff_test.go
@@ -0,0 +1,57 @@
+package util
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func parseDate(str string) time.Time {
+	t, _ := time.Parse(DateLayout, str)
+	return t
+}
+
+func toSecond(str string) int64 {
+	t, _ := time.Parse(DateLayout, str)
+	return t.Unix()
+}
+
+func TestDifferenceDays(t *testing.T) {
+	assert.Equal(t, StringDifferenceDays("2017-09-01", "2017-09-01"), 0)
+	assert.Equal(t, StringDifferenceDays("2017-09-01", "2017-09-02"), 1)
+	assert.Equal(t, StringDifferenceDays("2017-09-01", "2017-09-03"), 2)
+	assert.Equal(t, StringDifferenceDays("2017-09-01", "2017-09-04"), 3)
+
+	assert.Equal(t, StringDifferenceDays("2017-09-01", "2018-03-11"), 191)
+
+	assert.True(t, (StringDifferenceDays("2017-09-01", "2017-09-01")) == 0)
+	assert.True(t, (StringDifferenceDays("2017-09-01", "2017-09-02"))%1 == 0)
+	assert.True(t, (StringDifferenceDays("2017-09-01", "2017-09-03"))%2 == 0)
+}
+
+func TestTimeDifferenceDays(t *testing.T) {
+	assert.Equal(t, TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-01")), 0)
+	assert.Equal(t, TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-02")), 1)
+	assert.Equal(t, TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-03")), 2)
+	assert.Equal(t, TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-04")), 3)
+
+	assert.Equal(t, TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2018-03-11")), 191)
+
+	assert.True(t, (TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-01"))) == 0)
+	assert.True(t, (TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-02")))%1 == 0)
+	assert.True(t, (TimeDifferenceDays(parseDate("2017-09-01"), parseDate("2017-09-03")))%2 == 0)
+}
+
+func TestSecondsDifferenceDays(t *testing.T) {
+	assert.Equal(t, SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-01")), 0)
+	assert.Equal(t, SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-02")), 1)
+	assert.Equal(t, SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-03")), 2)
+	assert.Equal(t, SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-04")), 3)
+
+	assert.Equal(t, SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2018-03-11")), 191)
+
+	assert.True(t, (SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-01"))) == 0)
+	assert.True(t, (SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-02")))%1 == 0)
+	assert.True(t, (SecondsDifferenceDays(toSecond("2017-09-01"), toSecond("2017-09-03")))%2 == 0)
+}
diff --git a/time/trans.go b/time/trans.go
index ff05732..af8300e 100644
--- a/time/trans.go
+++ b/time/trans.go
@@ -6,10 +6,11 @@ import (
 	"github.com/tx7do/kratos-utils/trans"
 )
 
-const (
-	TimeLayout = "2006-01-02 15:04:05"
-	DateLayout = "2006-01-02"
-)
+var DefaultTimeLocation *time.Location
+
+func RefreshDefaultTimeLocation(name string) {
+	DefaultTimeLocation, _ = time.LoadLocation(name)
+}
 
 // UnixMilliToStringPtr 毫秒时间戳 -> 字符串
 func UnixMilliToStringPtr(tm *int64) *string {
@@ -38,12 +39,30 @@ func StringTimeToTime(str *string) *time.Time {
 	if len(*str) == 0 {
 		return nil
 	}
-	loc, _ := time.LoadLocation("Asia/Shanghai")
-	theTime, err := time.ParseInLocation(TimeLayout, *str, loc)
-	if err != nil {
-		return nil
+
+	if DefaultTimeLocation == nil {
+		RefreshDefaultTimeLocation(DefaultTimeLocationName)
 	}
-	return &theTime
+
+	var err error
+	var theTime time.Time
+
+	theTime, err = time.ParseInLocation(TimeLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	theTime, err = time.ParseInLocation(DateLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	theTime, err = time.ParseInLocation(ClockLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	return nil
 }
 
 // TimeToTimeString 时间 -> 时间字符串
@@ -62,12 +81,30 @@ func StringDateToTime(str *string) *time.Time {
 	if len(*str) == 0 {
 		return nil
 	}
-	loc, _ := time.LoadLocation("Asia/Shanghai")
-	theTime, err := time.ParseInLocation(DateLayout, *str, loc)
-	if err != nil {
-		return nil
+
+	if DefaultTimeLocation == nil {
+		RefreshDefaultTimeLocation(DefaultTimeLocationName)
 	}
-	return &theTime
+
+	var err error
+	var theTime time.Time
+
+	theTime, err = time.ParseInLocation(TimeLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	theTime, err = time.ParseInLocation(DateLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	theTime, err = time.ParseInLocation(ClockLayout, *str, DefaultTimeLocation)
+	if err == nil {
+		return &theTime
+	}
+
+	return nil
 }
 
 // TimeToDateString 时间 -> 日期字符串