sequence tweaks, removing market hours anything

util/time.go

@@ -18,3 +18,77 @@ func (tu timeUtil) ToFloat64(t time.Time) float64 {
 func (tu timeUtil) FromFloat64(tf float64) time.Time {
 	return time.Unix(0, int64(tf))
 }
+
+func (tu timeUtil) DiffDays(t1, t2 time.Time) (days int) {
+	t1n := t1.Unix()
+	t2n := t2.Unix()
+	var diff int64
+	if t1n > t2n {
+		diff = t2n - t1n //yields seconds
+	} else {
+		diff = t1n - t2n //yields seconds
+	}
+	return int(diff / (_secondsPerDay))
+}
+
+func (tu timeUtil) DiffHours(t1, t2 time.Time) (hours int) {
+	t1n := t1.Unix()
+	t2n := t2.Unix()
+	var diff int64
+	if t1n > t2n {
+		diff = t1n - t2n
+	} else {
+		diff = t2n - t1n
+	}
+	return int(diff / (_secondsPerHour))
+}
+
+// Start returns the earliest (min) time in a list of times.
+func (tu timeUtil) 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 (tu timeUtil) 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
+}
+
+// StartAndEnd returns the start and end of a given set of time in one pass.
+func (tu timeUtil) StartAndEnd(values ...time.Time) (start time.Time, end time.Time) {
+	if len(values) == 0 {
+		return
+	}
+
+	start = values[0]
+	end = values[0]
+
+	for _, v := range values[1:] {
+		if end.Before(v) {
+			end = v
+		}
+		if start.After(v) {
+			start = v
+		}
+	}
+	return
+}