def test_timestamp():
# Get a current timestamp
ts = timestamp()
dt = datetime_from_timestamp(ts)
now = datetime.utcnow().replace(tzinfo=UTC_TZ)
today = date.today()
assert(dt.tzinfo == UTC_TZ)
assert(dt.year == today.year)
assert(dt.month == today.month)
delta = now-dt
assert(delta.microseconds > 0)
assert(delta.seconds == 0)
def test_start_of_date():
sod = start_of_date(2011, 7, 22, CHI_TZ)
dt = datetime_from_timestamp(sod)
assert(dt.microsecond == 0)
assert(dt.second == 0)
assert(dt.minute == 0)
assert(dt.year == 2011)
assert(dt.month == 7)
assert(dt.day == 22)
assert(dt.tzinfo == UTC_TZ)
# not testing our code, just illustrating any datetime converted to a
# different timezone is still equivalent to the original
assert(dt == dt.astimezone(NY_TZ))
# chicago start of day, stored as UTC, converted to chicago time
assert(chicago_time(sod) == dt)
