const time.stdNeedDate

4 uses

	time (current package)
		format.go#L94: 	stdLongMonth             = iota + stdNeedDate  // "January"
		format.go#L112: 	stdLongYear              = iota + stdNeedDate  // "2006"
		format.go#L130: 	stdNeedDate  = 1 << 8             // need month, day, year
		format.go#L535: 		if year < 0 && std&stdNeedDate != 0 {