GetUtcOffsetFromUtc() [3/3]

static TimeSpan System.TimeZoneInfo.GetUtcOffsetFromUtc ( DateTime time, TimeZoneInfo zone, out bool isDaylightSavings, out bool isAmbiguousLocalDst )

inlinestaticpackage

Definition at line 2019 of file TimeZoneInfo.cs.

    {
        isDaylightSavings = false;
        isAmbiguousLocalDst = false;
        TimeSpan baseUtcOffset = zone.BaseUtcOffset;
        AdjustmentRule adjustmentRuleForTime;
        int? ruleIndex;
        int year;
        if (time > s_maxDateOnly)
        {
            adjustmentRuleForTime = zone.GetAdjustmentRuleForTime(DateTime.MaxValue, out ruleIndex);
            year = 9999;
        }
        else if (time < s_minDateOnly)
        {
            adjustmentRuleForTime = zone.GetAdjustmentRuleForTime(DateTime.MinValue, out ruleIndex);
            year = 1;
        }
        else
        {
            adjustmentRuleForTime = zone.GetAdjustmentRuleForTime(time, dateTimeisUtc: true, out ruleIndex);
            year = (time + baseUtcOffset).Year;
        }
        if (adjustmentRuleForTime != null)
        {
            baseUtcOffset += adjustmentRuleForTime.BaseUtcOffsetDelta;
            if (adjustmentRuleForTime.HasDaylightSaving)
            {
                isDaylightSavings = GetIsDaylightSavingsFromUtc(time, year, zone._baseUtcOffset, adjustmentRuleForTime, ruleIndex, out isAmbiguousLocalDst, zone);
                baseUtcOffset += (isDaylightSavings ? adjustmentRuleForTime.DaylightDelta : TimeSpan.Zero);
            }
        }
        return baseUtcOffset;
    }

References System.Runtime.Serialization.Dictionary, System.TimeZoneInfo.GetIsDaylightSavingsFromUtc(), System.DateTime.MaxValue, System.DateTime.MinValue, System.TimeZoneInfo.s_maxDateOnly, System.TimeZoneInfo.s_minDateOnly, System.year, and System.TimeSpan.Zero.