Parse single hour specs

go/remind/remind.go

			t = modifier(1, now)
			more = 2
		}
	default:
		return t, fmt.Errorf("unknown date spec '%s'", s)
	}
	if len(parts) == more {
		return t.Add(h), nil
	}
	l := len(parts)
	if (l == 1 || l == 2) && (strings.HasSuffix(parts[l-1], "am") || strings.HasSuffix(parts[l-1], "pm")) {
		s = parts[0]
		if l == 2 {
			s += parts[1]
		}
		h, err := parseHours(s)
		if err != nil {
			return t, err
		}
		t = truncateHours(now)
		return t.Add(h), nil
	}
	return t, fmt.Errorf("unknown date spec '%s' (unexpected)", s)
}

go/remind/remind_test.go

		{"in two weeks", now.AddDate(0, 0, 2*7)},
		{"in 3 weeks", now.AddDate(0, 0, 3*7)},
		//"2016-09-28",
		//"3pm",
		{"3pm", truncateHours(now).Add(15 * time.Hour)},
		{"3 pm", truncateHours(now).Add(15 * time.Hour)},
		{"in 4 days at 10 pm", truncateHours(now).AddDate(0, 0, 4).Add(22 * time.Hour)},
	}