diff --git a/parse.js b/parse.js
index c0976c9..b44de39 100644
--- a/parse.js
+++ b/parse.js
@@ -20,9 +20,10 @@ export class IsoDateParts {
 		}
 
 		let [hours, minutes] = [match[1], match[2]];
+		let sign = hours[0] === '-' ? -1 : 1;
 		return {
 			hours: parseInt(hours, 10) || 0,
-			minutes: parseInt(minutes, 10) || 0
+			minutes: (parseInt(minutes, 10) || 0) * sign
 		};
 	}
 
diff --git a/test/utils.js b/test/utils.js
index 37b564e..8bdaf95 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -25,11 +25,13 @@ export const VALID_TEST_CASES = `
 2016-05-25T09+01:00
 2016-05-25T09:24+01:00
 2016-05-25T09:24:15+01:00
+2016-05-25T09:24:15+01:15
 2016-05-25T09:24:15.123+01:00
 2016-05-25T09:24:15,123+01:00
 2016-05-25T09-01:00
 2016-05-25T09:24-01:00
 2016-05-25T09:24:15-01:00
+2016-05-25T09:24:15-01:15
 2016-05-25T09:24:15.123-01:00
 2016-05-25T09:24:15,123-01:00
 2016-05-25T09+06:00
@@ -73,8 +75,10 @@ export const VALID_TEST_CASES = `
 // Issue #1
 2016-05-25T09:24:15+06
 2016-05-25T09:24:15+0600
+2016-05-25T09:24:15+0615
 2016-05-25T09:24:15-06
 2016-05-25T09:24:15-0600
+2016-05-25T09:24:15-0615
 
 // 6 digit years
 +002000-01-01