diff --git a/src/common/datetimefmt.cpp b/src/common/datetimefmt.cpp
index 1ce36770ac..78feafc962 100644
--- a/src/common/datetimefmt.cpp
+++ b/src/common/datetimefmt.cpp
@@ -1549,7 +1549,14 @@ wxDateTime::ParseFormat(const wxString& date,
                         }
                     }
 
-                    if ( hours > 12 || minutes > 59 )
+                    /*
+                    Contemporary offset limits are -12:00 and +14:00.
+                    However historically offsets of over +/- 15 hours
+                    existed so be a bit more flexible. Info retrieved
+                    from Time Zone Database at
+                    https://www.iana.org/time-zones.
+                    */
+                    if ( hours > 15 || minutes > 59 )
                         return false;   // bad format
 
                     timeZone = 3600*hours + 60*minutes;
diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index 4b407760a3..e0c146611f 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -925,8 +925,8 @@ void DateTimeTestCase::TestTimeZoneParse()
 
         // Some invalid ones too.
 
-        { "00:00-1300" }, // Offset out of range.
-        { "00:00+1300" }, // Offset out of range.
+        { "00:00-1600" }, // Offset out of range.
+        { "00:00+1600" }, // Offset out of range.
 
         { "00:00+00:" }, // Minutes missing after colon separator.