1 files changed, 25 insertions, 0 deletions
diff --git a/hotline/time.go b/hotline/time.go
new file mode 100644
index 0000000..3b87864
--- /dev/null
+++ b/hotline/time.go
@@ -0,0 +1,25 @@
+package hotline
+
+import (
+	"encoding/binary"
+	"time"
+)
+
+// toHotlineTime converts a time.Time to the 8 byte Hotline time format:
+// Year (2 bytes), milliseconds (2 bytes) and seconds (4 bytes)
+func toHotlineTime(t time.Time) (b []byte) {
+	yearBytes := make([]byte, 2)
+	secondBytes := make([]byte, 4)
+
+	// Get a time.Time for January 1st 00:00 from t so we can calculate the difference in seconds from t
+	startOfYear := time.Date(t.Year(), time.January, 1, 0, 0, 0, 0, time.Local)
+
+	binary.BigEndian.PutUint16(yearBytes, uint16(t.Year()))
+	binary.BigEndian.PutUint32(secondBytes, uint32(t.Sub(startOfYear).Seconds()))
+
+	b = append(b, yearBytes...)
+	b = append(b, []byte{0, 0}...)
+	b = append(b, secondBytes...)
+
+	return b
+}