can fill values now

date.go

@@ -345,14 +345,22 @@ func (d date) CalculateMarketSecondsBetween(start, end, marketOpen, marketClose
 }
 
 const (
-	_secondsPerDay = 60 * 60 * 24
+	_secondsPerHour = 60 * 60
+	_secondsPerDay  = 60 * 60 * 24
 )
 
-func (d date) Diff(t1, t2 time.Time) (days int64) {
+func (d date) DiffDays(t1, t2 time.Time) (days int) {
 	t1n := t1.Unix()
 	t2n := t2.Unix()
-	diff := t1n - t2n
-	return diff / (_secondsPerDay)
+	diff := t2n - t1n //yields seconds
+	return int(diff / (_secondsPerDay))
+}
+
+func (d date) DiffHours(t1, t2 time.Time) (hours int) {
+	t1n := t1.Unix()
+	t2n := t2.Unix()
+	diff := t2n - t1n //yields seconds
+	return int(diff / (_secondsPerHour))
 }
 
 // NextDay returns the timestamp advanced a day.
@@ -386,3 +394,33 @@ func (d date) NextDayOfWeek(after time.Time, dayOfWeek time.Weekday) time.Time {
 	dayDelta := 7 - int(afterWeekday-dayOfWeek)
 	return after.AddDate(0, 0, dayDelta)
 }
+
+// Start returns the earliest (min) time in a list of times.
+func (d date) Start(times []time.Time) time.Time {
+	if len(times) == 0 {
+		return time.Time{}
+	}
+
+	start := times[0]
+	for _, t := range times[1:] {
+		if t.Before(start) {
+			start = t
+		}
+	}
+	return start
+}
+
+// Start returns the earliest (min) time in a list of times.
+func (d date) End(times []time.Time) time.Time {
+	if len(times) == 0 {
+		return time.Time{}
+	}
+
+	end := times[0]
+	for _, t := range times[1:] {
+		if t.After(end) {
+			end = t
+		}
+	}
+	return end
+}