// return values
// 0 - DST is off, yesterday was off
// 1 - DST is on, yesterday was off
// 2 - DST is on, yesterday was on
// 3 - DST is off, yesterday was on
public int GetDaylightChangeType(GPGregorianTime vc2)
{
long uToday = vc2.getTimestamp();
long uYesterday = uToday - 86400;
Transition tzToday = FindActiveTransition(uToday);
Transition tzYesterday = FindActiveTransition(uYesterday);
bool t1 = tzToday != null ? tzToday.Dst : false;
bool t2 = tzYesterday != null ? tzYesterday.Dst : false;
if (t1)
{
if (t2)
{
return(2);
}
else
{
return(1);
}
}
else if (t2)
{
return(3);
}
else
{
return(0);
}
}
public double BiasHoursForDate(GPGregorianTime vc)
{
Transition trans = FindActiveTransition(vc.getTimestamp());
if (trans != null)
{
return(Convert.ToDouble(trans.OffsetInSeconds - OffsetSeconds) / 3600.0);
}
return(0.0);
}