now.go
func (now *Now) MustParse(strs ...string) (t time.Time) {
	t, err := now.Parse(strs...)
	if err != nil {
		panic(err)
	}
	return t
}
func (now *Now) MustParse(strs ...string) (t time.Time) {
	t, err := now.Parse(strs...)
	if err != nil {
		panic(err)
	}
	return t
}
// MustParse must parse string to time or it will panic