Issue 1096

Using the below program:
-----
module timetest;
import std.stdio;
import std.date;
void main(char[][] args)
{
 foreach( arg ; args[1..$] )
 {
 auto time = parse(arg);
 time = UTCtoLocalTime(time); // Line 11
 auto str = toUTCString(time); // Line 12
 writefln(`"%s" = %s (%s)`, arg, time, str);
 }
}
-----
If I compile this and call it like this:
$ timetest "Jan 1"
The program hangs. If I comment out UTCtoLocalTime, and re-run with the same arguments, it outputs
"Jan 1" = -9223372036854775808 (Invalid Date)
Now it gets weird. If I un-comment line 11 and comment line 12 (replace the "str" arg to writefln with ""), I get:
"Jan 1" = -9223372036818775808 ()
And if I then comment-out line 11 again, rerun, I get:
"Jan 1" = -9223372036854775808 ()
So, for some reason, toUTCString fails on d_time_nan iif it has been passed through UTCtoLocalTime, despite the fact that UTCtoLocalTime doesn't change the value.

Fixed DMD 1.013