const time.stdDay

4 uses

	time (current package)
		format.go#L100: 	stdDay                                         // "2"
		format.go#L197: 			return layout[0:i], stdDay, layout[i+1:]
		format.go#L568: 		case stdDay:
		format.go#L904: 		case stdDay, stdUnderDay, stdZeroDay:

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