/// <summary>
/// Initializes a new instance of the <see cref="StandardDaylightAlternatingMap"/> class.
/// </summary>
/// <remarks>
/// At least one of the recurrences (it doesn't matter which) must be a "standard", i.e. not have any savings
/// applied. The other may still not have any savings (e.g. for America/Resolute) or (for BCL compatibility) may
/// even have negative daylight savings.
/// </remarks>
/// <param name="standardOffset">The standard offset.</param>
/// <param name="startRecurrence">The start recurrence.</param>
/// <param name="endRecurrence">The end recurrence.</param>
internal StandardDaylightAlternatingMap(Offset standardOffset, ZoneRecurrence startRecurrence, ZoneRecurrence endRecurrence)
{
this.standardOffset = standardOffset;
// Treat the recurrences as if they extended to the start of time.
startRecurrence = startRecurrence.ToStartOfTime();
endRecurrence = endRecurrence.ToStartOfTime();
Preconditions.CheckArgument(startRecurrence.IsInfinite, nameof(startRecurrence), "Start recurrence must extend to the end of time");
Preconditions.CheckArgument(endRecurrence.IsInfinite, nameof(endRecurrence), "End recurrence must extend to the end of time");
var dst = startRecurrence;
var standard = endRecurrence;
if (startRecurrence.Savings == Offset.Zero)
{
dst = endRecurrence;
standard = startRecurrence;
}
Preconditions.CheckArgument(standard.Savings == Offset.Zero, nameof(startRecurrence), "At least one recurrence must not have savings applied");
dstRecurrence = dst;
standardRecurrence = standard;
}
/// <summary>
/// Initializes a new instance of the <see cref="DaylightSavingsDateTimeZone"/> class.
/// </summary>
/// <remarks>
/// At least one of the recurrences (it doesn't matter which) must be a "standard", i.e. not have any savings
/// applied. The other may still not have any savings (e.g. for America/Resolute) or (for BCL compatibility) may
/// even have negative daylight savings.
/// </remarks>
/// <param name="id">The id.</param>
/// <param name="standardOffset">The standard offset.</param>
/// <param name="startRecurrence">The start recurrence.</param>
/// <param name="endRecurrence">The end recurrence.</param>
internal DaylightSavingsDateTimeZone([NotNull] String id, Offset standardOffset, ZoneRecurrence startRecurrence, ZoneRecurrence endRecurrence)
: base(id, false,
standardOffset + Offset.Min(startRecurrence.Savings, endRecurrence.Savings),
standardOffset + Offset.Max(startRecurrence.Savings, endRecurrence.Savings))
{
this.standardOffset = standardOffset;
// Treat the recurrences as if they extended to the start of time.
startRecurrence = startRecurrence.ToStartOfTime();
endRecurrence = endRecurrence.ToStartOfTime();
Preconditions.CheckArgument(startRecurrence.IsInfinite, nameof(startRecurrence), "Start recurrence must extend to the end of time");
Preconditions.CheckArgument(endRecurrence.IsInfinite, nameof(endRecurrence), "End recurrence must extend to the end of time");
var dst = startRecurrence;
var standard = endRecurrence;
if (startRecurrence.Savings == Offset.Zero)
{
dst = endRecurrence;
standard = startRecurrence;
}
Preconditions.CheckArgument(standard.Savings == Offset.Zero, nameof(startRecurrence), "At least one recurrence must not have savings applied");
dstRecurrence = dst;
standardRecurrence = standard;
}