const time.stdZeroYearDay

5 uses

	time (current package)
		format.go#L144: 	stdZeroYearDay                                 // "002"
		format.go#L236: 				return layout[0:i], stdZeroYearDay, layout[i+3:]
		format.go#L745: 		case stdZeroYearDay:
		format.go#L1133: 		case stdUnderYearDay, stdZeroYearDay:
		format.go#L1139: 			yday, value, err = getnum3(value, std == stdZeroYearDay)