const time.stdNeedClock

4 uses

	time (current package)
		format.go#L145: 	stdHour                  = iota + stdNeedClock // "15"
		format.go#L154: 	stdPM                    = iota + stdNeedClock // "PM"
		format.go#L172: 	stdNeedClock      = 1 << 10            // need hour, minute, second
		format.go#L701: 		if hour < 0 && std&stdNeedClock != 0 {