func DateMicro(year int, month time.Month, day, hour, min, sec, nsec int, loc *time.Location) MicroTime {
	return MicroTime{time.Date(year, month, day, hour, min, sec, nsec, loc)}
}

// NowMicro returns the current local time.
func NowMicro() MicroTime {
	return MicroTime{time.Now()}
}

// IsZero returns true if the value is nil or time is zero.
func (t *MicroTime) IsZero() bool {
	if t == nil {
		return true
	}