/// <summary>
/// Initializes a new instance of the <see cref="LegacyAvailabilityTimeZone"/> class.
/// </summary>
/// <param name="timeZoneInfo">The time zone used to initialize this instance.</param>
internal LegacyAvailabilityTimeZone(TimeZoneInfo timeZoneInfo)
: this()
{
// Availability uses the opposite sign for the bias, e.g. if TimeZoneInfo.BaseUtcOffset = 480 than
// SerializedTimeZone.Bias must be -480.
this.bias = -timeZoneInfo.BaseUtcOffset;
// To convert TimeZoneInfo into SerializableTimeZone, we need two time changes: one to Standard
// time, the other to Daylight time. TimeZoneInfo holds a list of adjustment rules that represent
// the different rules that govern time changes over the years. We need to grab one of those rules
// to initialize this instance.
AdjustmentRule[] adjustmentRules = timeZoneInfo.GetAdjustmentRulesEx();
if (adjustmentRules.Length == 0)
{
// If there are no adjustment rules (which is the case for UTC), we have to come up with two
// dummy time changes which both have a delta of zero and happen at two hard coded dates. This
// simulates a time zone in which there are no time changes.
this.daylightTime = new LegacyAvailabilityTimeZoneTime();
this.daylightTime.Delta = TimeSpan.Zero;
this.daylightTime.DayOrder = 1;
this.daylightTime.DayOfTheWeek = DayOfTheWeek.Sunday;
this.daylightTime.Month = 10;
this.daylightTime.TimeOfDay = TimeSpan.FromHours(2);
this.daylightTime.Year = 0;
this.standardTime = new LegacyAvailabilityTimeZoneTime();
this.standardTime.Delta = TimeSpan.Zero;
this.standardTime.DayOrder = 1;
this.standardTime.DayOfTheWeek = DayOfTheWeek.Sunday;
this.standardTime.Month = 3;
this.standardTime.TimeOfDay = TimeSpan.FromHours(2);
this.daylightTime.Year = 0;
}
else
{
// When there is at least one adjustment rule, we need to grab the last one which is the
// one that currently applies (TimeZoneInfo stores adjustment rules sorted from oldest to
// most recent).
AdjustmentRule currentRule = adjustmentRules[adjustmentRules.Length - 1];
this.standardTime = new LegacyAvailabilityTimeZoneTime(currentRule.DaylightTransitionEnd, TimeSpan.Zero);
// Again, TimeZoneInfo and SerializableTime use opposite signs for bias.
this.daylightTime = new LegacyAvailabilityTimeZoneTime(currentRule.DaylightTransitionStart, -currentRule.DaylightDelta);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TimeZoneDefinition"/> class.
/// </summary>
/// <param name="timeZoneInfo">The time zone info used to initialize this definition.</param>
internal TimeZoneDefinition(TimeZoneInfo timeZoneInfo)
: this()
{
this.Id = timeZoneInfo.Id;
this.Name = timeZoneInfo.DisplayName;
// TimeZoneInfo only supports one standard period, which bias is the time zone's base
// offset to UTC.
TimeZonePeriod standardPeriod = new TimeZonePeriod();
standardPeriod.Id = TimeZonePeriod.StandardPeriodId;
standardPeriod.Name = TimeZonePeriod.StandardPeriodName;
standardPeriod.Bias = -timeZoneInfo.BaseUtcOffset;
AdjustmentRule[] adjustmentRules = timeZoneInfo.GetAdjustmentRulesEx();
TimeZoneTransition transitionToStandardPeriod = new TimeZoneTransition(this, standardPeriod);
if (adjustmentRules.Length == 0)
{
this.periods.Add(standardPeriod.Id, standardPeriod);
// If the time zone info doesn't support Daylight Saving Time, we just need to
// create one transition to one group with one transition to the standard period.
TimeZoneTransitionGroup transitionGroup = new TimeZoneTransitionGroup(this, "0");
transitionGroup.Transitions.Add(transitionToStandardPeriod);
this.transitionGroups.Add(transitionGroup.Id, transitionGroup);
TimeZoneTransition initialTransition = new TimeZoneTransition(this, transitionGroup);
this.transitions.Add(initialTransition);
}
else
{
for (int i = 0; i < adjustmentRules.Length; i++)
{
TimeZoneTransitionGroup transitionGroup = new TimeZoneTransitionGroup(this, this.transitionGroups.Count.ToString());
transitionGroup.InitializeFromAdjustmentRule(adjustmentRules[i], standardPeriod);
this.transitionGroups.Add(transitionGroup.Id, transitionGroup);
TimeZoneTransition transition;
if (i == 0)
{
// If the first adjustment rule's start date in not undefined (DateTime.MinValue)
// we need to add a dummy group with a single, simple transition to the Standard
// period and a group containing the transitions mapping to the adjustment rule.
if (adjustmentRules[i].DateStart > DateTime.MinValue.Date)
{
TimeZoneTransition transitionToDummyGroup = new TimeZoneTransition(
this,
this.CreateTransitionGroupToPeriod(standardPeriod));
this.transitions.Add(transitionToDummyGroup);
AbsoluteDateTransition absoluteDateTransition = new AbsoluteDateTransition(this, transitionGroup);
absoluteDateTransition.DateTime = adjustmentRules[i].DateStart;
transition = absoluteDateTransition;
this.periods.Add(standardPeriod.Id, standardPeriod);
}
else
{
transition = new TimeZoneTransition(this, transitionGroup);
}
}
else
{
AbsoluteDateTransition absoluteDateTransition = new AbsoluteDateTransition(this, transitionGroup);
absoluteDateTransition.DateTime = adjustmentRules[i].DateStart;
transition = absoluteDateTransition;
}
this.transitions.Add(transition);
}
// If the last adjustment rule's end date is not undefined (DateTime.MaxValue),
// we need to create another absolute date transition that occurs the date after
// the last rule's end date. We target this additional transition to a group that
// contains a single simple transition to the Standard period.
DateTime lastAdjustmentRuleEndDate = adjustmentRules[adjustmentRules.Length - 1].DateEnd;
if (lastAdjustmentRuleEndDate < DateTime.MaxValue.Date)
{
AbsoluteDateTransition transitionToDummyGroup = new AbsoluteDateTransition(
this,
this.CreateTransitionGroupToPeriod(standardPeriod));
transitionToDummyGroup.DateTime = lastAdjustmentRuleEndDate.AddDays(1);
this.transitions.Add(transitionToDummyGroup);
}
}
}
