strftime.go
func repl(match string, t time.Time) string {
	if match == "%%" {
		return "%"
	}

	formatFunc, ok := formats[match]
	if ok {
		return formatFunc(t)
	}
	return formatNanoForMatch(match, t)
}
func repl(match string, t time.Time) string {
	if match == "%%" {
		return "%"
	}

	formatFunc, ok := formats[match]
	if ok {
		return formatFunc(t)
	}
	return formatNanoForMatch(match, t)
}
// repl replaces % directives with right time