public static iCalTimeZone FromSystemTimeZone(System.TimeZoneInfo tzinfo)
{
var adjustmentRules = tzinfo.GetAdjustmentRules();
var utcOffset = tzinfo.BaseUtcOffset;
var dday_tz = new iCalTimeZone();
foreach (var adjustmentRule in adjustmentRules)
{
var delta = adjustmentRule.DaylightDelta;
dday_tz.TZID = tzinfo.Id;
var dday_tzinfo_standard = new DDay.iCal.Components.iCalTimeZoneInfo();
dday_tzinfo_standard.Name = "STANDARD";
dday_tzinfo_standard.Start = adjustmentRule.DateStart;
if (dday_tzinfo_standard.Start.Year < 1800)
dday_tzinfo_standard.Start = dday_tzinfo_standard.Start.AddYears(1800 - dday_tzinfo_standard.Start.Year);
dday_tzinfo_standard.TZOffsetFrom = new DDay.iCal.DataTypes.UTC_Offset(utcOffset + delta);
dday_tzinfo_standard.TZOffsetTo = new DDay.iCal.DataTypes.UTC_Offset(utcOffset);
PopulateiCalTimeZoneInfo(dday_tzinfo_standard, adjustmentRule.DaylightTransitionEnd, adjustmentRule.DateStart.Year);
// Add the "standard" time rule to the time zone
dday_tz.AddChild(dday_tzinfo_standard);
var dday_tzinfo_daylight = new DDay.iCal.Components.iCalTimeZoneInfo();
dday_tzinfo_daylight.Name = "DAYLIGHT";
dday_tzinfo_daylight.Start = adjustmentRule.DateStart;
if (dday_tzinfo_daylight.Start.Year < 1800)
dday_tzinfo_daylight.Start = dday_tzinfo_daylight.Start.AddYears(1800 - dday_tzinfo_daylight.Start.Year);
dday_tzinfo_daylight.TZOffsetFrom = new DDay.iCal.DataTypes.UTC_Offset(utcOffset);
dday_tzinfo_daylight.TZOffsetTo = new DDay.iCal.DataTypes.UTC_Offset(utcOffset + delta);
PopulateiCalTimeZoneInfo(dday_tzinfo_daylight, adjustmentRule.DaylightTransitionStart, adjustmentRule.DateStart.Year);
// Add the "daylight" time rule to the time zone
dday_tz.AddChild(dday_tzinfo_daylight);
}
return dday_tz;
}
public static iCalTimeZone FromSystemTimeZone(System.TimeZoneInfo tzinfo, DateTime earlistDateTimeToSupport, bool includeHistoricalData)
{
var adjustmentRules = tzinfo.GetAdjustmentRules();
var utcOffset = tzinfo.BaseUtcOffset;
var dday_tz = new iCalTimeZone();
dday_tz.TZID = tzinfo.Id;
IDateTime earliest = new iCalDateTime(earlistDateTimeToSupport);
foreach (var adjustmentRule in adjustmentRules)
{
// Only include historical data if asked to do so. Otherwise,
// use only the most recent adjustment rule available.
if (!includeHistoricalData && adjustmentRule.DateEnd < earlistDateTimeToSupport)
continue;
var delta = adjustmentRule.DaylightDelta;
var dday_tzinfo_standard = new iCalTimeZoneInfo();
dday_tzinfo_standard.Name = "STANDARD";
dday_tzinfo_standard.TimeZoneName = tzinfo.StandardName;
dday_tzinfo_standard.Start = new iCalDateTime(new DateTime(adjustmentRule.DateStart.Year, adjustmentRule.DaylightTransitionEnd.Month, adjustmentRule.DaylightTransitionEnd.Day, adjustmentRule.DaylightTransitionEnd.TimeOfDay.Hour, adjustmentRule.DaylightTransitionEnd.TimeOfDay.Minute, adjustmentRule.DaylightTransitionEnd.TimeOfDay.Second).AddDays(1));
if (dday_tzinfo_standard.Start.LessThan(earliest))
dday_tzinfo_standard.Start = dday_tzinfo_standard.Start.AddYears(earliest.Year - dday_tzinfo_standard.Start.Year);
dday_tzinfo_standard.OffsetFrom = new UTCOffset(utcOffset + delta);
dday_tzinfo_standard.OffsetTo = new UTCOffset(utcOffset);
PopulateiCalTimeZoneInfo(dday_tzinfo_standard, adjustmentRule.DaylightTransitionEnd, adjustmentRule.DateStart.Year);
// Add the "standard" time rule to the time zone
dday_tz.AddChild(dday_tzinfo_standard);
if (tzinfo.SupportsDaylightSavingTime)
{
var dday_tzinfo_daylight = new iCalTimeZoneInfo();
dday_tzinfo_daylight.Name = "DAYLIGHT";
dday_tzinfo_daylight.TimeZoneName = tzinfo.DaylightName;
dday_tzinfo_daylight.Start = new iCalDateTime(new DateTime(adjustmentRule.DateStart.Year, adjustmentRule.DaylightTransitionStart.Month, adjustmentRule.DaylightTransitionStart.Day, adjustmentRule.DaylightTransitionStart.TimeOfDay.Hour, adjustmentRule.DaylightTransitionStart.TimeOfDay.Minute, adjustmentRule.DaylightTransitionStart.TimeOfDay.Second));
if (dday_tzinfo_daylight.Start.LessThan(earliest))
dday_tzinfo_daylight.Start = dday_tzinfo_daylight.Start.AddYears(earliest.Year - dday_tzinfo_daylight.Start.Year);
dday_tzinfo_daylight.OffsetFrom = new UTCOffset(utcOffset);
dday_tzinfo_daylight.OffsetTo = new UTCOffset(utcOffset + delta);
PopulateiCalTimeZoneInfo(dday_tzinfo_daylight, adjustmentRule.DaylightTransitionStart, adjustmentRule.DateStart.Year);
// Add the "daylight" time rule to the time zone
dday_tz.AddChild(dday_tzinfo_daylight);
}
}
// If no time zone information was recorded, at least
// add a STANDARD time zone element to indicate the
// base time zone information.
if (dday_tz.TimeZoneInfos.Count == 0)
{
var dday_tzinfo_standard = new iCalTimeZoneInfo();
dday_tzinfo_standard.Name = "STANDARD";
dday_tzinfo_standard.TimeZoneName = tzinfo.StandardName;
dday_tzinfo_standard.Start = earliest;
dday_tzinfo_standard.OffsetFrom = new UTCOffset(utcOffset);
dday_tzinfo_standard.OffsetTo = new UTCOffset(utcOffset);
// Add the "standard" time rule to the time zone
dday_tz.AddChild(dday_tzinfo_standard);
}
return dday_tz;
}