now.go
func (now *Now) Sunday() time.Time {
	t := now.BeginningOfDay()
	weekday := int(t.Weekday())
	if weekday == 0 {
		return t
	}
	return t.AddDate(0, 0, (7 - weekday))
}
func (now *Now) Sunday() time.Time {
	t := now.BeginningOfDay()
	weekday := int(t.Weekday())
	if weekday == 0 {
		return t
	}
	return t.AddDate(0, 0, (7 - weekday))
}
// Sunday sunday