def test_as_unit(self):
ts = Timestamp("1970-01-01")
assert ts._as_unit("ns") is ts
res = ts._as_unit("us")
assert res.value == ts.value // 1000
assert res._reso == NpyDatetimeUnit.NPY_FR_us.value
rt = res._as_unit("ns")
assert rt.value == ts.value
assert rt._reso == ts._reso
res = ts._as_unit("ms")
assert res.value == ts.value // 1_000_000
assert res._reso == NpyDatetimeUnit.NPY_FR_ms.value
rt = res._as_unit("ns")
assert rt.value == ts.value
assert rt._reso == ts._reso
res = ts._as_unit("s")
assert res.value == ts.value // 1_000_000_000
assert res._reso == NpyDatetimeUnit.NPY_FR_s.value
rt = res._as_unit("ns")
assert rt.value == ts.value
assert rt._reso == ts._reso
def test_as_unit_non_nano(self):
# case where we are going neither to nor from nano
ts = Timestamp("1970-01-02")._as_unit("ms")
assert ts.year == 1970
assert ts.month == 1
assert ts.day == 2
assert ts.hour == ts.minute == ts.second == ts.microsecond == ts.nanosecond == 0
res = ts._as_unit("s")
assert res.value == 24 * 3600
assert res.year == 1970
assert res.month == 1
assert res.day == 2
assert (res.hour == res.minute == res.second == res.microsecond ==
res.nanosecond == 0)
