def test_nat_arithmetic(self):
# GH 6873
nat = tslib.NaT
t = Timestamp('2014-01-01')
dt = datetime.datetime(2014, 1, 1)
delta = datetime.timedelta(3600)
td = Timedelta('5s')
i = 2
f = 1.5
for (left, right) in [(nat, i), (nat, f), (nat, np.nan)]:
self.assertTrue((left / right) is nat)
self.assertTrue((left * right) is nat)
self.assertTrue((right * left) is nat)
with tm.assertRaises(TypeError):
right / left
# Timestamp / datetime
for (left, right) in [(nat, nat), (nat, t), (nat, dt)]:
# NaT __add__ or __sub__ Timestamp-like (or inverse) returns NaT
self.assertTrue((right + left) is nat)
self.assertTrue((left + right) is nat)
self.assertTrue((left - right) is nat)
self.assertTrue((right - left) is nat)
# timedelta-like
# offsets are tested in test_offsets.py
for (left, right) in [(nat, delta), (nat, td)]:
# NaT + timedelta-like returns NaT
self.assertTrue((right + left) is nat)
self.assertTrue((left + right) is nat)
self.assertTrue((right - left) is nat)
self.assertTrue((left - right) is nat)
def test_now(self):
# #9000
ts_from_string = Timestamp('now')
ts_from_method = Timestamp.now()
ts_datetime = datetime.datetime.now()
ts_from_string_tz = Timestamp('now', tz='US/Eastern')
ts_from_method_tz = Timestamp.now(tz='US/Eastern')
# Check that the delta between the times is less than 1s (arbitrarily small)
delta = Timedelta(seconds=1)
self.assertTrue((ts_from_method - ts_from_string) < delta)
self.assertTrue((ts_from_method_tz - ts_from_string_tz) < delta)
self.assertTrue(
(ts_from_string_tz.tz_localize(None) - ts_from_string) < delta)
def test_today(self):
ts_from_string = Timestamp('today')
ts_from_method = Timestamp.today()
ts_datetime = datetime.datetime.today()
ts_from_string_tz = Timestamp('today', tz='US/Eastern')
ts_from_method_tz = Timestamp.today(tz='US/Eastern')
# Check that the delta between the times is less than 1s (arbitrarily small)
delta = Timedelta(seconds=1)
self.assertTrue(abs(ts_from_method - ts_from_string) < delta)
self.assertTrue(abs(ts_datetime - ts_from_method) < delta)
self.assertTrue(abs(ts_from_method_tz - ts_from_string_tz) < delta)
self.assertTrue(
abs(
ts_from_string_tz.tz_localize(None) -
ts_from_method_tz.tz_localize(None)) < delta)