Introduce a relative time parsing function

go/remind/remind.go

}
func parseTime(s string) (time.Time, error) {
	var t time.Time
	now := time.Now().Round(time.Second)
	return parseTimeRelative(s, now)
}
func parseTimeRelative(s string, now time.Time) (time.Time, error) {
	var t time.Time
	parts := strings.Fields(s)
	// more indicates the parts index where there might be "more"