const time.stdNeedClock

4 uses

	time (current package)
		format.go#L124: 	stdHour                  = iota + stdNeedClock // "15"
		format.go#L133: 	stdPM                    = iota + stdNeedClock // "PM"
		format.go#L150: 	stdNeedClock      = 2 << 8             // need hour, minute, second
		format.go#L633: 		if hour < 0 && std&stdNeedClock != 0 {