func (td TinyDate) Weekday() time.Weekday {
	t := td.ToTime()
	return t.Weekday()
}
Weekday returns the day of the week
package tinydate
import "time"
func (td TinyDate) Year() int {
	return int(td.year)
}
func (td TinyDate) Month() time.Month {
	return time.Month(td.month + 1)
}
func (td TinyDate) Day() int {
	return int(td.day + 1)
}
func (td TinyDate) String() string {
	return td.Format(iso8601Date)
}
func (td TinyDate) IsZero() bool {
	return td.year == 0 && td.month == 0 && td.day == 0
}
func (td TinyDate) Unix() int64 {
	t := td.ToTime()
	return t.Unix()
}
func (td TinyDate) UnixNano() int64 {
	t := td.ToTime()
	return t.UnixNano()
}