diff --git a/src/format/formatters/index.js b/src/format/formatters/index.js
index 4fe9718..6b307b7 100644
--- a/src/format/formatters/index.js
+++ b/src/format/formatters/index.js
@@ -119,7 +119,7 @@ function formatTimezone(offset, dirtyDelimeter) {
   var sign = offset > 0 ? '-' : '+'
   var absOffset = Math.abs(offset)
   var hours = addLeadingZeros(Math.floor(absOffset / 60), 2)
-  var minutes = addLeadingZeros(absOffset % 60, 2)
+  var minutes = addLeadingZeros(Math.floor(absOffset % 60), 2)
   return sign + hours + delimeter + minutes
 }
 
diff --git a/src/format/test.js b/src/format/test.js
index 5991f5a..fd4a3f4 100644
--- a/src/format/test.js
+++ b/src/format/test.js
@@ -684,6 +684,13 @@ describe('format', function () {
       const result = format(offsetDate, "yyyy-MM-dd h:mmaaaaa'm' xxx XXX OOO zzz", { timeZone })
       assert.equal(result, '2020-10-31 9:37pm -05:00 -05:00 GMT-5 CDT')
     })
+
+    it('https://github.com/marnusw/date-fns-tz/issues/168', () => {
+      const timeZone = 'Europe/Stockholm'
+      const dateInUTC = Date.UTC(1888, 11, 1)
+      const result = format(dateInUTC, "yyyy-MM-dd'T'HH:mm:ss.SSSxxx", { timeZone })
+      assert.equal(result, '1888-12-01T01:00:14.000+01:00')
+    })
   })
 
   describe('timestamp', function () {