[bugfix] Support unusual historic timezone offsets (fixes #5236) (#5237)

diff --git a/src/lib/units/offset.js b/src/lib/units/offset.js
index 752358f0d8c367b3bfebe1e7acca003f733402be..f670ccc3e977fe12b1381b1ff295924c871cbcc1 100644 (file)
--- a/src/lib/units/offset.js
+++ b/src/lib/units/offset.js
@@ -81,7 +81,7 @@ export function cloneWithOffset(input, model) {
 function getDateOffset (m) {
     // On Firefox.24 Date#getTimezoneOffset returns a floating point.
     // https://github.com/moment/moment/pull/1871
-    return -Math.round(m._d.getTimezoneOffset() / 15) * 15;
+    return -Math.round(m._d.getTimezoneOffset());
 }
 
 // HOOKS