/// <summary>
/// Despite holding several adjustment rules, Outlook will only use the rule that is marked as effective.
/// (see http://msdn.microsoft.com/en-us/library/ff960389.aspx )
/// We should ignore all other rules to be consistent with Outlook (all versions).
/// </summary>
public TimeZoneInfo ToTimeZoneInfo()
{
TimeZoneRuleStructure effectiveTimeZoneRuleStructure = GetEffectiveTimeZoneRule();
if (effectiveTimeZoneRuleStructure == null)
{
throw new InvalidPropertyException("No timezone rule has been marked as effective");
}
TimeZoneInfo.AdjustmentRule effectiveTimeZoneRule = effectiveTimeZoneRuleStructure.ToStaticAdjustmentRule();
string standardDisplayName;
string daylightDisplayName;
string timezoneID = KeyName;
if (KeyName == String.Empty)
{
// It's invalid to have an empty timezone ID, use the ID of current timezone
timezoneID = TimeZoneInfo.Local.Id;
}
string displayName = RegistryTimeZoneUtils.GetDisplayName(timezoneID, out standardDisplayName, out daylightDisplayName);
if (effectiveTimeZoneRule == null)
{
// no daylight savings
return(TimeZoneInfo.CreateCustomTimeZone(timezoneID, effectiveTimeZoneRuleStructure.BaseUtcOffset, displayName, standardDisplayName));
}
else
{
TimeZoneInfo.AdjustmentRule[] adjustmentRules = new TimeZoneInfo.AdjustmentRule[] { effectiveTimeZoneRule };
return(TimeZoneInfo.CreateCustomTimeZone(timezoneID, effectiveTimeZoneRuleStructure.BaseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules));
}
}
public TimeZoneInfo ToTimeZoneInfo(string timeZoneID)
{
// baseUtcOffset should be 120 for GMT+2:00
TimeSpan baseUtcOffset = new TimeSpan(0, -(lBias + lStandardBias), 0);
string standardDisplayName;
string daylightDisplayName;
string displayName = RegistryTimeZoneUtils.GetDisplayName(timeZoneID, out standardDisplayName, out daylightDisplayName);
// Note about stStandardDate:
// If the time zone does not support daylight saving time, the wMonth member in the SYSTEMTIME structure MUST be zero
if (stStandardDate.wMonth == 0)
{
return(TimeZoneInfo.CreateCustomTimeZone(timeZoneID, baseUtcOffset, displayName, standardDisplayName));
}
else
{
TimeZoneInfo.AdjustmentRule rule;
if (stStandardDate.wYear == 0)
{
// If the wYear member is zero, the date is interpreted as a relative date that occurs yearly
rule = AdjustmentRuleUtils.CreateStaticAdjustmentRule(lBias, lStandardBias, lDaylightBias, stStandardDate, stDaylightDate);
}
else
{
// If the wYear member is not zero, the date is interpreted as an absolute date that only occurs once.
DateTime ruleStartDate = DateTimeUtils.GetYearStart(stStandardDate.wYear).Date;
DateTime ruleEndDate = DateTimeUtils.GetYearEnd(stStandardDate.wYear).Date;
rule = AdjustmentRuleUtils.CreateAdjustmentRule(ruleStartDate, ruleEndDate, lBias, lStandardBias, lDaylightBias, stStandardDate, stDaylightDate);
}
return(TimeZoneInfo.CreateCustomTimeZone(timeZoneID, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, new TimeZoneInfo.AdjustmentRule[] { rule }));
}
}
