diff --git a/snikket/Date.hx b/snikket/Date.hx
index 51aeff4..25a3466 100644
--- a/snikket/Date.hx
+++ b/snikket/Date.hx
@@ -7,7 +7,7 @@ class Date {
 		var tzMinute = Std.int(Math.abs(d.getTimezoneOffset())%60);
 		return
 			str + (tzHour < 0 ? "+" : "-") +
-			StringTools.lpad(Std.string(tzHour), "0", 2) + ":" +
+			StringTools.lpad(Std.string(Math.abs(tzHour)), "0", 2) + ":" +
 			StringTools.lpad(Std.string(tzMinute), "0", 2);
 	}
 }