public void TestTimezoneOffset()
{
int year = Rand.GetInt(2, 3000);
int mon = Rand.GetInt(1, 12);
int day = Rand.GetInt(1, DateTime.DaysInMonth(year, mon));
int hour = Rand.GetInt(0, 23);
int min = Rand.GetInt(0, 59);
int sec = Rand.GetInt(0, 59);
double tz = Rand.GetDouble(3, UTCDate.TIMEZONE_MIN, UTCDate.TIMEZONE_MAX);
UTCDate udt = new UTCDate(tz, null, year, mon, day, hour, min, sec);
DateTime dt = new DateTime(year, mon, day, hour, min, sec);
dt = dt.AddHours(-tz); // resolve tz offset
Assert.True(udt.ExtractUTC().CompareTo(dt) == 0);
Assert.True(udt.ExtractUTC().Kind == DateTimeKind.Utc);
Assert.True(udt.ExtractStandard().Kind == DateTimeKind.Local);
Assert.True(udt.ExtractLocal().Kind == DateTimeKind.Local);
}
/**
* Traverse year and verify dst status.
*/
private void TestDST(int tz, DaylightTime dst)
{
DateTime lower = dst.Start;
TimeSpan dst_span = dst.Delta;
int day = 15;
int hour = 12;
int min = 0;
int sec = 0;
for (int i=UTCDate.MONTH_MIN; i<=UTCDate.MONTH_MAX; i++) {
// compute dates using UTCDate
UTCDate udt = new UTCDate(tz, dst, lower.Year, i, day, hour, min, sec);
DateTime dt_utc = udt.ExtractUTC();
DateTime dt_std = udt.ExtractStandard();
DateTime dt_loc = udt.ExtractLocal();
// compute dates manually
// utc time -> resolve timezone offset and dst
DateTime dt_utc2 = new DateTime(lower.Year, i, day, hour, min, sec,
DateTimeKind.Utc);
dt_utc2 = dt_utc2.AddHours(-tz); // resolve tz offset
if (udt.IsDST) dt_utc2 = dt_utc2.Add(-dst_span); // resolve dst
// standard time -> resolve dst only
DateTime dt_std2 = new DateTime(lower.Year, i, day, hour, min, sec,
DateTimeKind.Local);
if (udt.IsDST) dt_std2 = dt_std2.Add(-dst_span); // resolve dst
// standard time -> given as input
DateTime dt_loc2 = new DateTime(lower.Year, i, day, hour, min, sec,
DateTimeKind.Local);
Assert.True(dt_utc.CompareTo(dt_utc2) == 0);
Assert.True(dt_std.CompareTo(dt_std2) == 0);
Assert.True(dt_loc.CompareTo(dt_loc2) == 0);
}
}