Do not fail on timezone operation before epoch on Windows

dateutil fails to use tzlocal on Windows for datetime before epoch.
So we just skip the timezone conversion which result in using UTC.

issue4582
review36231003

doc/usage.rst

@@ -593,6 +593,11 @@ increases if lower case or decreases if upper case:
     - `i`: by one minute
     - `s`: by one second
 
+.. warn::
+    Under Windows, the datetime before 1970 are shown in UTC instead of the
+    local timezone.
+..
+
 Search Widget
 ^^^^^^^^^^^^^
 

tryton/common/common.py

@@ -1344,11 +1344,16 @@ def timezoned_date(date, reverse=False):
     szone = dateutil.tz.tzutc()
     if reverse:
         lzone, szone = szone, lzone
-    return date.replace(tzinfo=szone).astimezone(lzone).replace(tzinfo=None)
+    try:
+        return (date.replace(tzinfo=szone).astimezone(lzone)
+            .replace(tzinfo=None))
+    except (ValueError, OSError):
+        # https://github.com/dateutil/dateutil/issues/434
+        return date.replace(tzinfo=None)
 
 
 def untimezoned_date(date):
-    return timezoned_date(date, reverse=True).replace(tzinfo=None)
+    return timezoned_date(date, reverse=True)
 
 
 def humanize(size):