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# 

# LSST Data Management System 

# 

# Copyright 2008-2017 AURA/LSST. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

import os 

import pickle 

import time 

import unittest 

 

from lsst.daf.base import DateTime 

import lsst.pex.exceptions as pexExcept 

 

 

class DateTimeTestCase(unittest.TestCase): 

"""A test case for DateTime.""" 

 

def setUp(self): 

self.timeScales = (DateTime.TAI, DateTime.TT, DateTime.UTC) 

self.dateSystems = (DateTime.JD, DateTime.MJD, DateTime.EPOCH) 

 

def testMJD(self): 

ts = DateTime(45205.125, DateTime.MJD, DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.UTC), 399006000000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 399006021000000000) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.UTC), 45205.125) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.TAI), 45205.125 + 21.0/86400.0) 

self.assertTrue(ts.isValid()) 

 

def testLeapSecond(self): 

trials = ((45205., 21), 

(41498.99, 10), 

(41499.01, 11), 

(57203.99, 35), 

(57204.01, 36), 

(57000., 35), 

(57210., 36)) 

for mjd, diff in trials: 

ts = DateTime(mjd, DateTime.MJD, DateTime.UTC) 

delta = ts.nsecs(DateTime.TAI) - ts.nsecs(DateTime.UTC) 

self.assertEqual(delta/1E9, diff) 

 

def testNsecs(self): 

ts = DateTime(1192755473000000000, DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1192755473000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1192755506000000000) 

self.assertEqual(ts.nsecs(), 1192755506000000000) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.UTC), 54392.040196759262) 

ts2 = ts 

self.assertEqual(ts, ts2) 

ts2 = DateTime(1192755473000000000, DateTime.UTC) 

self.assertEqual(ts, ts2) 

ts2 = DateTime(1234567890000000000, DateTime.UTC) 

self.assertNotEqual(ts, ts2) 

 

def testBoundaryMJD(self): 

ts = DateTime(47892.0, DateTime.MJD, DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.UTC), 631152000000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 631152025000000000) 

self.assertEqual(ts.get(DateTime.MJD, DateTime.UTC), 47892.0) 

 

def testCrossBoundaryNsecs(self): 

ts = DateTime(631151998000000000, DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.UTC), 631151998000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 631152022000000000) 

 

def testNsecsTAI(self): 

ts = DateTime(1192755506000000000, DateTime.TAI) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1192755473000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1192755506000000000) 

self.assertEqual(ts.nsecs(), 1192755506000000000) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.UTC), 54392.040196759262) 

self.assertTrue(ts.isValid()) 

 

def testNsecsDefault(self): 

ts = DateTime(1192755506000000000) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1192755473000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1192755506000000000) 

self.assertEqual(ts.nsecs(), 1192755506000000000) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.UTC), 54392.040196759262) 

self.assertTrue(ts.isValid()) 

 

def testNow(self): 

successes = 0 

for _ in range(10): 

secs = time.time() 

ts = DateTime.now() 

diff = ts.nsecs(DateTime.UTC)/1.0e9 - secs 

107 ↛ 103line 107 didn't jump to line 103, because the condition on line 107 was never false if diff > -0.001 and diff < 0.1: 

successes += 1 

self.assertGreaterEqual(successes, 3) 

 

def testIsoEpoch(self): 

ts = DateTime("19700101T000000Z", DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.UTC), 0) 

self.assertEqual(ts.toString(ts.UTC), "1970-01-01T00:00:00.000000000Z") 

 

def testIsoUTCBasic(self): 

"""Test basic ISO string input and output of UTC dates""" 

for dateSep in ("-", ""): # "-" date separator is optional 

for timeSep in (":", ""): # ":" time separator is optional 

for decPt in (".", ","): # "." or "," may be used as decimal point 

dateStr = "2009{0}04{0}02T07{1}26{1}39{2}314159265Z".format(dateSep, timeSep, decPt) 

ts = DateTime(dateStr, DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.TT), 1238657265498159265) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1238657233314159265) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1238657199314159265) 

self.assertEqual(ts.toString(ts.UTC), "2009-04-02T07:26:39.314159265Z") 

 

def testIsoNonUTCBasics(self): 

"""Test basic ISO string input and output of TAI and TT dates""" 

for scale in (DateTime.TAI, DateTime.TT): 

for dateSep in ("-", ""): # "-" date separator is optional 

for timeSep in (":", ""): # ":" time separator is optional 

for decPt in (".", ","): # "." or "," may be used as decimal point 

dateStr = "2009{0}04{0}02T07{1}26{1}39{2}314159265".format(dateSep, timeSep, decPt) 

ts = DateTime(dateStr, scale) 

self.assertEqual(ts.toString(scale), "2009-04-02T07:26:39.314159265") 

self.assertTrue(ts.isValid()) 

 

def testIsoExpanded(self): 

ts = DateTime("2009-04-02T07:26:39.314159265Z", DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1238657233314159265) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1238657199314159265) 

self.assertEqual(ts.toString(ts.UTC), "2009-04-02T07:26:39.314159265Z") 

self.assertTrue(ts.isValid()) 

 

def testIsoNoNSecs(self): 

ts = DateTime("2009-04-02T07:26:39Z", DateTime.UTC) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1238657233000000000) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1238657199000000000) 

self.assertEqual(ts.toString(ts.UTC), "2009-04-02T07:26:39.000000000Z") 

self.assertTrue(ts.isValid()) 

 

def testIsoThrow(self): 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04-01T23:36:05", DateTime.UTC) # Z time zone required for UTC 

for scale in (DateTime.TAI, DateTime.TT): 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04-01T23:36:05Z", scale) # Z time zone forbidden for TAI or TT 

 

for scale in self.timeScales: 

with self.assertRaises(pexExcept.DomainError): 

DateTime("20090401", scale) # time required 

with self.assertRaises(pexExcept.DomainError): 

DateTime("20090401T", DateTime.UTC) # time required 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04-01T", DateTime.UTC) # time required 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04-01T23:36:05-0700", DateTime.UTC) # time zone offset not supported 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009/04/01T23:36:05Z", DateTime.UTC) # "/" not valid 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04-01T23:36", DateTime.UTC) # partial time 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04", DateTime.UTC) # partial date without time 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2009-04T23:36.05", DateTime.UTC) # partial date with time 

with self.assertRaises(pexExcept.DomainError): 

DateTime("09-04-01T23:36:05", DateTime.UTC) # 2 digit year 

 

# earliest allowed UTC date is the earliest date in the leap second table 

try: 

minLeapSecUTC = "1961-01-01T00:00:00Z" 

dt = DateTime(minLeapSecUTC, DateTime.UTC) 

dt.toString(DateTime.UTC) 

except Exception: 

self.fail("minLeapSecUTC={} failed, but should be OK".format(minLeapSecUTC)) 

with self.assertRaises(pexExcept.DomainError): 

DateTime("1960-01-01T23:59:59Z", DateTime.UTC) # just before leap second table starts 

 

# earliest allowed date for TAI and TT is year = 1902 

for timeSys in (DateTime.TAI, DateTime.TT): 

try: 

earliestDate = "1902-01-01T00:00:00" 

dt = DateTime(earliestDate, timeSys) 

dt.toString(DateTime.TAI) 

dt.toString(DateTime.TT) 

except Exception: 

self.fail("{} system={} failed, but should be OK".format(earliestDate, timeSys)) 

 

# dates before the leap second table can be created using TAI or TT, but not viewed in UTC 

earlyDt = DateTime("1960-01-01T00:00:00", DateTime.TAI) 

with self.assertRaises(pexExcept.DomainError): 

earlyDt.toString(DateTime.UTC) 

 

with self.assertRaises(pexExcept.DomainError): 

DateTime("1901-12-12T23:59:59Z", DateTime.TAI) # too early 

with self.assertRaises(pexExcept.DomainError): 

DateTime("1700-01-01T00:00:00Z", DateTime.TAI) # way too early 

with self.assertRaises(pexExcept.DomainError): 

DateTime("2262-01-01T00:00:00Z", DateTime.TAI) # too late 

with self.assertRaises(pexExcept.DomainError): 

DateTime("3200-01-01T00:00:00Z", DateTime.TAI) # way too late 

 

def testWraparound(self): 

"""Test that a date later than 2038-01-19, 03:14:07 does not wrap around 

 

This will fail on old versions of unix, and indicates that DateTime is not safe 

""" 

dateStr = "2040-01-01T00:00:00.000000000" 

self.assertEqual(str(DateTime(dateStr, DateTime.TAI)), "DateTime(\"{}\", TAI)".format(dateStr)) 

 

def testDM7622(self): 

"""Test DM-7622: date with unix time = -1 seconds must be usable 

 

Note that the call in question parses the ISO string without paying 

attention to the scale (it applies the scale later), 

so the same ISO string is wanted in all cases 

(except with a trailing Z for UTC, and without for TAI and TT) 

""" 

negOneSecIso = "1969-12-31T23:59:59.000000000" 

for scale in self.timeScales: 

dateStr = negOneSecIso + ("Z" if scale == DateTime.UTC else "") 

try: 

dt = DateTime(dateStr, scale) 

except Exception: 

self.fail("Date {} unusable; DM-7622 is still with us".format(dateStr, scale)) 

self.assertEqual(dt.nsecs(scale), int(-1e9)) 

 

def testStr(self): 

timeStr1 = "2004-03-01T12:39:45.1" 

fullTimeStr1 = "2004-03-01T12:39:45.100000000" 

dt1 = DateTime(timeStr1, DateTime.TAI) 

self.assertEqual(str(dt1), "DateTime(\"{}\", TAI)".format(fullTimeStr1)) 

self.assertEqual(repr(dt1), "DateTime(\"{}\", TAI)".format(fullTimeStr1)) 

 

timeStr2 = "2004-03-01T12:39:45.000000001" 

dt2 = DateTime(timeStr2, DateTime.TAI) 

self.assertEqual(str(dt2), "DateTime(\"{}\", TAI)".format(timeStr2)) 

self.assertEqual(repr(dt2), "DateTime(\"{}\", TAI)".format(timeStr2)) 

 

def testNsecsTT(self): 

ts = DateTime(1192755538184000000, DateTime.TT) 

self.assertEqual(ts.nsecs(DateTime.UTC), 1192755473000000000) 

self.assertEqual(ts.nsecs(DateTime.TAI), 1192755506000000000) 

self.assertEqual(ts.nsecs(), 1192755506000000000) 

self.assertAlmostEqual(ts.get(DateTime.MJD, DateTime.UTC), 54392.040196759262) 

self.assertTrue(ts.isValid()) 

 

def testFracSecs(self): 

ts = DateTime("2004-03-01T12:39:45.1Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '2004-03-01T12:39:45.100000000Z') 

ts = DateTime("2004-03-01T12:39:45.01Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '2004-03-01T12:39:45.010000000Z') 

ts = DateTime("2004-03-01T12:39:45.000000001Z", DateTime.UTC) # nanosecond 

self.assertEqual(ts.toString(ts.UTC), '2004-03-01T12:39:45.000000001Z') 

ts = DateTime("2004-03-01T12:39:45.0000000001Z", DateTime.UTC) # too small 

self.assertEqual(ts.toString(ts.UTC), '2004-03-01T12:39:45.000000000Z') 

 

def testInvalid(self): 

ts = DateTime() 

self.assertFalse(ts.isValid()) 

for scale in self.timeScales: 

self.assertEqual(ts.nsecs(scale), DateTime.invalid_nsecs) 

for system in self.dateSystems: 

with self.assertRaises(pexExcept.RuntimeError): 

ts.get(system, scale) 

with self.assertRaises(pexExcept.RuntimeError): 

ts.gmtime(scale) 

with self.assertRaises(pexExcept.RuntimeError): 

ts.timespec(scale) 

with self.assertRaises(pexExcept.RuntimeError): 

ts.timeval(scale) 

with self.assertRaises(pexExcept.RuntimeError): 

ts.toString(scale) 

self.assertEqual(repr(ts), "DateTime()") 

 

def testNegative(self): 

ts = DateTime("1969-03-01T00:00:32Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-03-01T00:00:32.000000000Z') 

ts = DateTime("1969-01-01T00:00:00Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-01-01T00:00:00.000000000Z') 

ts = DateTime("1969-01-01T00:00:40Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-01-01T00:00:40.000000000Z') 

ts = DateTime("1969-01-01T00:00:38Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-01-01T00:00:38.000000000Z') 

ts = DateTime("1969-03-01T12:39:45Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-03-01T12:39:45.000000000Z') 

ts = DateTime("1969-03-01T12:39:45.000000001Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-03-01T12:39:45.000000001Z') 

self.assertTrue(ts.isValid()) 

 

# Note slight inaccuracy in UTC-TAI-UTC round-trip 

ts = DateTime("1969-03-01T12:39:45.12345Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-03-01T12:39:45.123449996Z') 

ts = DateTime("1969-03-01T12:39:45.123456Z", DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-03-01T12:39:45.123455996Z') 

 

ts = DateTime(-1, DateTime.TAI) 

self.assertEqual(ts.toString(ts.UTC), '1969-12-31T23:59:51.999918239Z') 

ts = DateTime(0, DateTime.TAI) 

self.assertEqual(ts.toString(ts.UTC), '1969-12-31T23:59:51.999918240Z') 

ts = DateTime(1, DateTime.TAI) 

self.assertEqual(ts.toString(ts.UTC), '1969-12-31T23:59:51.999918241Z') 

 

ts = DateTime(-1, DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1969-12-31T23:59:59.999999999Z') 

ts = DateTime(0, DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1970-01-01T00:00:00.000000000Z') 

ts = DateTime(1, DateTime.UTC) 

self.assertEqual(ts.toString(ts.UTC), '1970-01-01T00:00:00.000000001Z') 

 

def testConvert(self): 

year = 2012 

month = 7 

day = 19 

hour = 18 

minute = 29 

second = 33 

 

ts = DateTime(year, month, day, hour, minute, second, DateTime.UTC) 

dt = ts.toPython(DateTime.UTC) 

 

self.assertEqual(dt.year, year) 

self.assertEqual(dt.month, month) 

self.assertEqual(dt.day, day) 

self.assertEqual(dt.hour, hour) 

self.assertEqual(dt.minute, minute) 

self.assertEqual(dt.second, second) 

 

def testPickle(self): 

ts = DateTime(int(1192755473000000000), DateTime.UTC) 

nts = pickle.loads(pickle.dumps(ts)) 

self.assertEqual(nts.nsecs(DateTime.UTC), int(1192755473000000000)) 

 

 

class TimeZoneBaseTestCase(DateTimeTestCase): 

timezone = "" 

 

def setUp(self): 

DateTimeTestCase.setUp(self) 

self.tz = os.environ.setdefault('TZ', "") 

os.environ['TZ'] = self.timezone 

 

def tearDown(self): 

355 ↛ 358line 355 didn't jump to line 358, because the condition on line 355 was never false if self.tz == "": 

del os.environ['TZ'] 

else: 

os.environ['TZ'] = self.tz 

 

 

class BritishTimeTestCase(TimeZoneBaseTestCase): 

timezone = "Europe/London" 

 

 

class BritishTime2TestCase(TimeZoneBaseTestCase): 

timezone = "GMT0BST" 

 

 

class PacificTimeTestCase(TimeZoneBaseTestCase): 

timezone = "PST8PDT" 

 

 

373 ↛ 374line 373 didn't jump to line 374, because the condition on line 373 was never trueif __name__ == '__main__': 

unittest.main()