Here's how to do it as a one-liner: python -c "import datetime; import time; print 'Only %d days until Christmas' % (datetime.date(2004, 12, 25) - datetime.date.fromtimestamp(time.time())).days"
Here's a slightly shorter way of doing it:
python -c "import time; print 'Only %f more days until Christmas' %
(float(time.mktime(time.strptime('2004-12-25', '%Y-%m-%d')) -
time.time()) / 86400)"
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