GetUtcOffsetFromUniversalTime()

long System.CurrentSystemTimeZone.GetUtcOffsetFromUniversalTime ( DateTime time, ref bool isAmbiguousLocalDst )

inlinepackage

Definition at line 29 of file CurrentSystemTimeZone.cs.

    {
        TimeSpan timeSpan = new TimeSpan(m_ticksOffset);
        DaylightTime daylightChanges = GetDaylightChanges(time.Year);
        isAmbiguousLocalDst = false;
        if (daylightChanges == null || daylightChanges.Delta.Ticks == 0L)
        {
            return timeSpan.Ticks;
        }
        DateTime dateTime = daylightChanges.Start - timeSpan;
        DateTime dateTime2 = daylightChanges.End - timeSpan - daylightChanges.Delta;
        DateTime dateTime3;
        DateTime dateTime4;
        if (daylightChanges.Delta.Ticks > 0)
        {
            dateTime3 = dateTime2 - daylightChanges.Delta;
            dateTime4 = dateTime2;
        }
        else
        {
            dateTime3 = dateTime;
            dateTime4 = dateTime - daylightChanges.Delta;
        }
        if ((!(dateTime > dateTime2)) ? (time >= dateTime && time < dateTime2) : (time < dateTime2 || time >= dateTime))
        {
            timeSpan += daylightChanges.Delta;
            if (time >= dateTime3 && time < dateTime4)
            {
                isAmbiguousLocalDst = true;
            }
        }
        return timeSpan.Ticks;
    }

References System.Globalization.DaylightTime.Delta, System.CurrentSystemTimeZone.GetDaylightChanges(), System.L, System.CurrentSystemTimeZone.m_ticksOffset, System.TimeSpan.Ticks, and System.DateTime.Year.

Referenced by System.CurrentSystemTimeZone.ToLocalTime().