The .NET Framework documentation is not clear whether or not the
DateTime construtors create a local time or a UTC time DateTime
instance. So I ran the following snippet:

DateTime t1 = new DateTime(1970, 1, 1, 0, 0, 0);
DateTime t2 = t1.ToUniversalTime();
Console.WriteLine("t1={0}, t2={1}", t1, t2);

and got this output (.NET 1.1):

t1=1/1/1970 12:00:00 AM, t2=1/1/1970 5:00:00 AM

This proved me that DateTime construtors create local time DateTime.
(This also proved that the documentation of TimeZone.GetUtcOffset
Method is wrong since the example states that new DateTime( 2000, 1, 1
) is a UTC time.)

So far, I'm using strings to create a UTC DateTime as follow:

DateTime t3 = DateTime.Parse("1970-01-01 00:00:00+0",
DateTimeFormatInfo.InvariantInfo);
DateTime t4 = t3.ToUniversalTime();

The ouput is:

t3=12/31/1969 7:00:00 PM, t4=1/1/1970 12:00:00 AM

Using strings is not a very elegant programming style. Does anybody
know how to create a UTC DateTime without a string???

The only thing I can possibly find is:

DateTime t5 = new DateTime(1970, 1, 1);
t5 = t5 - TimeZone.CurrentTimeZone.GetUtcOffset(t4);

which is not very elagant too.

Any hints will be greatly appreciated,
-- Laurent