/// <summary>
/// Creates a new <see cref="BclDateTimeZone" /> from a <see cref="TimeZoneInfo"/> from the Base Class Library.
/// </summary>
/// <param name="bclZone">The original time zone to take information from.</param>
/// <returns>A <see cref="BclDateTimeZone"/> wrapping the given <c>TimeZoneInfo</c>.</returns>
public static BclDateTimeZone FromTimeZoneInfo(TimeZoneInfo bclZone)
{
Preconditions.CheckNotNull(bclZone, nameof(bclZone));
Offset standardOffset = bclZone.BaseUtcOffset.ToOffset();
var rules = bclZone.GetAdjustmentRules();
if (!bclZone.SupportsDaylightSavingTime || rules.Length == 0)
{
var fixedInterval = new ZoneInterval(bclZone.StandardName, Instant.BeforeMinValue, Instant.AfterMaxValue, standardOffset, Offset.Zero);
return(new BclDateTimeZone(bclZone, standardOffset, standardOffset, new SingleZoneIntervalMap(fixedInterval)));
}
int windowsRules = rules.Count(IsWindowsRule);
var ruleConverter = AreWindowsStyleRules(rules)
? rule => BclAdjustmentRule.FromWindowsAdjustmentRule(bclZone, rule)
: (Converter <TimeZoneInfo.AdjustmentRule, BclAdjustmentRule>)(rule => BclAdjustmentRule.FromUnixAdjustmentRule(bclZone, rule));
BclAdjustmentRule[] convertedRules = Array.ConvertAll(rules, ruleConverter);
Offset minRuleOffset = convertedRules.Aggregate(Offset.MaxValue, (min, rule) => Offset.Min(min, rule.Savings + rule.StandardOffset));
Offset maxRuleOffset = convertedRules.Aggregate(Offset.MinValue, (min, rule) => Offset.Max(min, rule.Savings + rule.StandardOffset));
IZoneIntervalMap uncachedMap = BuildMap(convertedRules, standardOffset, bclZone.StandardName);
IZoneIntervalMap cachedMap = CachingZoneIntervalMap.CacheMap(uncachedMap);
return(new BclDateTimeZone(bclZone, Offset.Min(standardOffset, minRuleOffset), Offset.Max(standardOffset, maxRuleOffset), cachedMap));
}
/// <summary>
/// Creates a new <see cref="BclDateTimeZone" /> from a <see cref="TimeZoneInfo"/> from the Base Class Library.
/// </summary>
/// <param name="bclZone">The original time zone to take information from.</param>
/// <returns>A <see cref="BclDateTimeZone"/> wrapping the given <c>TimeZoneInfo</c>.</returns>
public static BclDateTimeZone FromTimeZoneInfo(TimeZoneInfo bclZone)
{
Preconditions.CheckNotNull(bclZone, nameof(bclZone));
Offset standardOffset = bclZone.BaseUtcOffset.ToOffset();
var rules = bclZone.GetAdjustmentRules();
if (!bclZone.SupportsDaylightSavingTime || rules.Length == 0)
{
var fixedInterval = new ZoneInterval(bclZone.StandardName, Instant.BeforeMinValue, Instant.AfterMaxValue, standardOffset, Offset.Zero);
return(new BclDateTimeZone(bclZone, new SingleZoneIntervalMap(fixedInterval)));
}
BclAdjustmentRule[] convertedRules;
if (AreWindowsStyleRules(rules))
{
convertedRules = Array.ConvertAll(rules, rule => BclAdjustmentRule.FromWindowsAdjustmentRule(bclZone, rule));
}
else
{
convertedRules = Array.ConvertAll(rules, rule => BclAdjustmentRule.FromUnixAdjustmentRule(bclZone, rule));
FixUnixTransitions(convertedRules);
}
IZoneIntervalMap uncachedMap = BuildMap(convertedRules, standardOffset, bclZone.StandardName);
IZoneIntervalMap cachedMap = CachingZoneIntervalMap.CacheMap(uncachedMap);
return(new BclDateTimeZone(bclZone, cachedMap));
}
