diff --git a/weather/weather.go b/weather/weather.go
index 1265c50..3174a53 100644
--- a/weather/weather.go
+++ b/weather/weather.go
@@ -81,13 +81,12 @@ type TimelineHeader struct {
 
 // NewHeader creates and populates a new timeline header
 // and returns it
-func NewHeader(evtType EventType, expires time.Duration) TimelineHeader {
-	now := time.Now()
-	_, offset := now.Zone()
-	now = now.Add(time.Duration(offset) * time.Second)
+func NewHeader(t time.Time, evtType EventType, expires time.Duration) TimelineHeader {
+	_, offset := t.Zone()
+	t = t.Add(time.Duration(offset) * time.Second)
 
 	return TimelineHeader{
-		Timestamp: uint64(now.Unix()),
+		Timestamp: uint64(t.Unix()),
 		Expires:   uint32(expires.Seconds()),
 		EventType: evtType,
 	}