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#!/usr/bin/env python
import unittest, time
from datetime import datetime, tzinfo, timedelta
from ephem import Date, localtime, to_timezone, UTC
millisecond = 1.0 / 24.0 / 60.0 / 60.0 / 1e3
class CET(tzinfo):
"""central european time without daylight saving time"""
def utcoffset(self, dt):
return timedelta(hours=1) + self.dst(dt)
def dst(self, dt):
return timedelta(0)
# Determine whether dates behave reasonably.
class DateTests(unittest.TestCase):
def setUp(self):
self.date = Date('2004/09/04 00:17:15.8')
def test_date_constructor(self):
def construct_and_compare(args1, args2):
d1, d2 = Date(args1), Date(args2)
self.assertTrue(abs(d1 - d2) < millisecond,
'dates not equal:\n %r = date%r\n %r = date%r'
% (d1.tuple(), args1, d2.tuple(), args2))
std = '2004/09/04 00:17:15.8'
pairs = [
[std, '2004.67489614324023472'],
[std, ' 2004.67489614324023472 '],
[std, '2004/9/4.0119884259259257'],
[std, ' 2004/9/4.0119884259259257 '],
[std, '2004/9/4 0.28772222222222221'],
[std, ' 2004/9/4 0.28772222222222221 '],
[std, '2004/9/4 0:17.263333333333332'],
[std, ' 2004/9/4 0:17.263333333333332 '],
[std, '2004/9/4 0:17:15.8'],
[std, ' 2004/9/4 0:17:15.8 '],
[std, ' 2004-9-4 0:17:15.8 '],
['2004', (2004,)],
[' 2004 ', (2004,)],
['2004/09', (2004, 9)],
[' 2004/09 ', (2004, 9)],
[std, (2004, 9, 4.0119884259259257)],
[std, (2004, 9, 4, 0.28772222222222221)],
[std, (2004, 9, 4, 0, 17.263333333333332)],
[std, (2004, 9, 4, 0, 17, 15.8)],
[std, (datetime(2004, 9, 4, 0, 17, 15, 800000))],
]
for arg1, arg2 in pairs:
construct_and_compare(arg1, arg2)
if type(arg2) is str:
construct_and_compare(arg1, ' %s ' % arg2)
def test_date_parser_error_message(self):
with self.assertRaises(ValueError) as e:
Date('bad string')
self.assertEqual(
str(e.exception),
"your date string 'bad string' does"
" not look like a year/month/day optionally"
" followed by hours:minutes:seconds",
)
def test_year_zero(self):
# I would have thought the year would be 0, but it looks like
# libastro considers 1 BC to be the year -1?
self.assertEqual(str(Date('0')), '-1/1/1 00:00:00')
def test_date_string_value(self):
self.assertEqual(str(self.date), '2004/9/4 00:17:16')
def test_date_triple_value(self):
self.assertEqual(self.date.triple(), (2004, 9, 4.0119884259256651))
def test_date_tuple_value(self):
self.assertEqual(self.date.tuple(),
(2004, 9, 4, 0, 17, 15.8))
def test_another_tuple_value(self):
#d = Date((1994, 7, 16, 20, 15, 0))
d = Date(34530.34375)
self.assertEqual(d.tuple(), (1994, 7, 16, 20, 15, 0))
def test_tuple_that_rounded_to_negative_seconds(self): # Github issue 223
d = Date(44417.49999991596)
self.assertEqual(d.tuple(), (2021, 8, 10, 23, 59, 59.992739))
def test_localtime_modern(self):
if time.timezone == 18000: # test only works in Eastern time zone
self.assertEqual(localtime(Date('2009/6/23 8:47')),
datetime(2009, 6, 23, 4, 47, 0))
def test_timezone_aware_utc(self):
timezoned_date = to_timezone(self.date, UTC)
self.assertEqual(timezoned_date.tzinfo, UTC)
self.assertEqual(timezoned_date.hour, 0)
self.assertEqual(timezoned_date.minute, 17)
self.assertEqual(timezoned_date.second, 15)
self.assertEqual(timezoned_date.day, 4)
self.assertEqual(timezoned_date.month, 9)
self.assertEqual(timezoned_date.year, 2004)
def test_timezone_aware_cet(self):
cet = CET()
timezoned_date = to_timezone(self.date, cet)
self.assertEqual(timezoned_date.tzinfo, cet)
self.assertEqual(timezoned_date.hour, 1)
self.assertEqual(timezoned_date.minute, 17)
self.assertEqual(timezoned_date.second, 15)
self.assertEqual(timezoned_date.day, 4)
self.assertEqual(timezoned_date.month, 9)
self.assertEqual(timezoned_date.year, 2004)
# I am commenting this out for now because I am not sure that I can
# fix it without either writing an entirely new time module for
# PyEphem, or making PyEphem depend on another Python module - which
# would be its first-ever external dependency.
def OFF_test_localtime_premodern(self):
if time.timezone == 18000: # test only works in Eastern time zone
self.assertEqual(localtime(Date('1531/8/24 2:49')),
datetime(1957, 10, 4, 15, 28, 34, 4))
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