now.go
func (now *Now) EndOfMonth() time.Time {
	return now.BeginningOfMonth().AddDate(0, 1, 0).Add(-time.Nanosecond)
}
func (now *Now) EndOfMonth() time.Time {
	return now.BeginningOfMonth().AddDate(0, 1, 0).Add(-time.Nanosecond)
}
// EndOfMonth end of month