调整：dateTime类型，新增部份time.Time类似的方法

dateTime/dt.go

@@ -27,8 +27,27 @@ func New(time time.Time) DateTime {
 	}
 }
 
+// New 初始化
+func NewUnix(sec int64) DateTime {
+	return DateTime{
+		time: time.Unix(sec,0),
+	}
+}
+
+// New 初始化
+func NewUnixMilli(msec int64) DateTime {
+	return DateTime{
+		time: time.UnixMilli(msec),
+	}
+}
+
+// Since time.Now().Sub(dt).
+func Since(dt DateTime) time.Duration {
+	return time.Since(dt.ToTime())
+}
+
 // ToString 转字符串，yyyy-MM-dd hh:mm:ss
-func (receiver *DateTime) ToString(format string) string {
+func (receiver DateTime) ToString(format string) string {
 	// 2006-01-02 15:04:05
 	format = strings.Replace(format, "yyyy", "2006", -1)
 	format = strings.Replace(format, "yy", "06", -1)
@@ -46,90 +65,105 @@ func (receiver *DateTime) ToString(format string) string {
 }
 
 // Year 获取年
-func (receiver *DateTime) Year() int { return receiver.time.Year() }
+func (receiver DateTime) Year() int { return receiver.time.Year() }
 
 // Month 获取月
-func (receiver *DateTime) Month() int { return int(receiver.time.Month()) }
+func (receiver DateTime) Month() int { return int(receiver.time.Month()) }
 
 // Day 获取日
-func (receiver *DateTime) Day() int { return receiver.time.Day() }
+func (receiver DateTime) Day() int { return receiver.time.Day() }
 
 // Hour 获取小时
-func (receiver *DateTime) Hour() int { return receiver.time.Hour() }
+func (receiver DateTime) Hour() int { return receiver.time.Hour() }
 
 // Minute 获取分钟
-func (receiver *DateTime) Minute() int { return receiver.time.Minute() }
+func (receiver DateTime) Minute() int { return receiver.time.Minute() }
 
 // Second 获取秒
-func (receiver *DateTime) Second() int { return receiver.time.Second() }
+func (receiver DateTime) Second() int { return receiver.time.Second() }
 
 // TotalSeconds 获取总秒数
-func (receiver *DateTime) TotalSeconds() float64 {
+func (receiver DateTime) TotalSeconds() float64 {
 	return receiver.time.Sub(time.Date(0, 0, 0, 0, 0, 0, 0, time.Local)).Seconds()
 }
 
 // Duration 得到Duration
-func (receiver *DateTime) Duration() time.Duration {
+func (receiver DateTime) Duration() time.Duration {
 	return receiver.time.Sub(time.Date(0, 0, 0, 0, 0, 0, 0, time.Local))
 }
 
 // UnixMilli 获取毫秒
-func (receiver *DateTime) UnixMilli() int64 { return receiver.time.UnixMilli() }
+func (receiver DateTime) UnixMilli() int64 { return receiver.time.UnixMilli() }
 
 // UnixMicro 获取微秒
-func (receiver *DateTime) UnixMicro() int64 { return receiver.time.UnixMicro() }
+func (receiver DateTime) UnixMicro() int64 { return receiver.time.UnixMicro() }
 
 // UnixNano 获取纳秒
-func (receiver *DateTime) UnixNano() int64 { return receiver.time.UnixNano() }
+func (receiver DateTime) UnixNano() int64 { return receiver.time.UnixNano() }
 
 // Date 获取Date部份
-func (receiver *DateTime) Date() DateTime {
+func (receiver DateTime) Date() DateTime {
 	year, month, day := receiver.time.Date()
 	return New(time.Date(year, month, day, 0, 0, 0, 0, time.Local))
 }
 
 // AddDate 添加Date
-func (receiver *DateTime) AddDate(years int, months int, days int) DateTime {
+func (receiver DateTime) AddDate(years int, months int, days int) DateTime {
 	return New(receiver.time.AddDate(years, months, days))
 }
 
 // AddTime 添加Time
-func (receiver *DateTime) AddTime(hours int, minutes int, seconds int) DateTime {
+func (receiver DateTime) AddTime(hours int, minutes int, seconds int) DateTime {
 	return New(receiver.time.Add(time.Hour * time.Duration(hours)).Add(time.Minute * time.Duration(minutes)).Add(time.Second * time.Duration(seconds)))
 }
 
 // AddYears 添加年
-func (receiver *DateTime) AddYears(year int) DateTime {
+func (receiver DateTime) AddYears(year int) DateTime {
 	return New(receiver.time.AddDate(year, 0, 0))
 }
 
 // AddMonths 添加月份
-func (receiver *DateTime) AddMonths(months int) DateTime {
+func (receiver DateTime) AddMonths(months int) DateTime {
 	return New(receiver.time.AddDate(0, months, 0))
 }
 
 // AddDays 添加天数
-func (receiver *DateTime) AddDays(days int) DateTime {
+func (receiver DateTime) AddDays(days int) DateTime {
 	return New(receiver.time.AddDate(0, 0, days))
 }
 
 // AddHours 添加小时
-func (receiver *DateTime) AddHours(hours int) DateTime {
+func (receiver DateTime) AddHours(hours int) DateTime {
 	return New(receiver.time.Add(time.Hour * time.Duration(hours)))
 }
 
 // AddMinutes 添加分钟
-func (receiver *DateTime) AddMinutes(minutes int) DateTime {
+func (receiver DateTime) AddMinutes(minutes int) DateTime {
 	return New(receiver.time.Add(time.Minute * time.Duration(minutes)))
 }
 
 // AddSeconds 添加秒
-func (receiver *DateTime) AddSeconds(seconds int) DateTime {
+func (receiver DateTime) AddSeconds(seconds int) DateTime {
 	return New(receiver.time.Add(time.Second * time.Duration(seconds)))
 }
 
+// AddMillisecond 添加毫秒
+func (receiver DateTime) AddMillisecond(millisecond int) DateTime {
+	return New(receiver.time.Add(time.Duration(millisecond) * time.Millisecond))
+}
+
+// Sub 时间相减
+func (receiver DateTime) Sub(dt DateTime) time.Duration{
+	return receiver.time.Sub(dt.time)
+}
+
 // ToTime 获取time.Time类型
-func (receiver *DateTime) ToTime() time.Time { return receiver.time }
+func (receiver DateTime) ToTime() time.Time { return receiver.time }
+
+// After 是否比dt时间大（晚）
+func (receiver DateTime) After(dt DateTime) bool{
+	return receiver.time.After(dt.time)
+}
 
 // MarshalJSON to output non base64 encoded []byte
 // 此处不能用指针，否则json序列化时不执行