Oh my, this is actually pretty impressive:
"Now" gives August 29, 2013, 10:45:22 am, which is the current time.
"Now + 3 hours" gives August 29, 2013, 01:45:22 pm
"Today, 1 PM" gives August 29, 2013, 01:00:00 pm.
"Tomorrow" gives August 30, 2013, 12:00:00 am, always at midnight (for me)--does it always show midnight for others?
"Tomorrow 14:30" gives August 30, 2013, 02:30:00 pm
"Next Monday, midnight" gives September 02, 2013, 12:00:00 am
"Now + 2 weeks" gives: September 12, 2013, 10:45:22 am
Alas, [time]Christmas[/time] doesn't work, but it would be amusing.