internal static ExTimeZone PromoteCustomizedTimeZone(ExTimeZone customizedTimeZone)
{
ExTimeZone exTimeZone = null;
if (customizedTimeZone.IsCustomTimeZone && !ExTimeZoneEnumerator.Instance.TryGetTimeZoneByName(customizedTimeZone.AlternativeId, out exTimeZone))
{
string displayName = customizedTimeZone.LocalizableDisplayName.ToString();
List <ExTimeZone> list = TimeZoneHelper.MatchCustomTimeZoneByEffectiveRule(customizedTimeZone);
exTimeZone = TimeZoneHelper.GetUniqueTimeZoneMatch(list, displayName);
if (exTimeZone == null && list.Count > 1)
{
List <ExTimeZone> timeZones = TimeZoneHelper.MatchCustomTimeZoneByRules(customizedTimeZone, list);
exTimeZone = TimeZoneHelper.GetUniqueTimeZoneMatch(timeZones, displayName);
}
}
return(exTimeZone);
}