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COPYING
View file @ 02d0fba7
......@@ -37,3 +37,196 @@ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
calendar calculation routines in _cftime.pyx derived from calcalcs.c by David W. Pierce with the
following license:
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for software and other kinds of works.
The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the recipients the same freedoms that you received. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights.
Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software. For both users' and authors' sake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.
Some devices are designed to deny users access to install or run modified versions of the software inside them, although the manufacturer can do so. This is fundamentally incompatible with the aim of protecting users' freedom to change the software. The systematic pattern of such abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If such problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents. States should not allow patents to restrict development and use of software on general-purpose computers, but in those that do, we wish to avoid the special danger that patents applied to a free program could make it effectively proprietary. To prevent this, the GPL assures that patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and modification follow.
TERMS AND CONDITIONS
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* a) Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License; or
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Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.
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If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
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The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
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15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM .AS IS. WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
README.md
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......@@ -6,6 +6,10 @@ Time-handling functionality from netcdf4-python
[![PyPI package](https://badge.fury.io/py/cftime.svg)](http://python.org/pypi/cftime)
## News
10/27/2018: version 1.0.2 released. Improved accuracy (from approximately 1000 microseconds to 10 microseconds on x86
platforms). Refactored calendar calculations now allow for negative reference years. num2date function now more than an
order of magnitude faster. `months since` units now allowed, but only for `360_day` calendar.
08/15/2018: version 1.0.1 released.
11/8/2016: `cftime` was split out of the [netcdf4-python](https://github.com/Unidata/netcdf4-python) package.
......
cftime/__init__.py
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from ._cftime import utime, JulianDayFromDate, DateFromJulianDay
from ._cftime import _parse_date, date2index, time2index
from ._cftime import datetime
from ._cftime import datetime, real_datetime
from ._cftime import DatetimeNoLeap, DatetimeAllLeap, Datetime360Day, DatetimeJulian, \
DatetimeGregorian, DatetimeProlepticGregorian
from ._cftime import microsec_units, millisec_units, \
......
cftime/_cftime.pyx
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This diff is collapsed.
debian/changelog
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cftime (1.0.1-2) UNRELEASED; urgency=medium
cftime (1.0.2-1) unstable; urgency=medium
* New upstream release.
* Bump Standards-Version to 4.2.1, no changes.
* Update copyright file to include GPL-3+ for calcalcs code.
-- Bas Couwenberg <sebastic@debian.org> Tue, 28 Aug 2018 09:48:42 +0200
-- Bas Couwenberg <sebastic@debian.org> Sat, 27 Oct 2018 10:03:04 +0200
cftime (1.0.1-1) unstable; urgency=medium
......
debian/copyright
View file @ 02d0fba7
......@@ -6,8 +6,11 @@ Source: https://github.com/Unidata/cftime
Files: *
Copyright: 2008, Jeffrey Whitaker
2007, Michael Twomey
2010, David W. Pierce
Comment: Parts of pyiso8601 are included under the MIT license.
License: ISC and Expat
calendar calculation routines in _cftime.pyx derived from calcalcs.c by
David W. Pierce, licensed under the GPL-3+.
License: ISC and Expat and GPL-3+
Files: debian/*
Copyright: 2018, Bas Couwenberg <sebastic@debian.org>
......@@ -48,3 +51,17 @@ License: Expat
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
License: GPL-3+
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.
.
On Debian systems, the full text of the GNU General Public License
version 3 can be found in the file
`/usr/share/common-licenses/GPL-3'.
test/benchmark.py 0 → 100644
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from cftime import num2date, date2num
import time
import numpy as np
units = 'hours since 01-01-01'
calendar = 'standard'
timevals = np.arange(0,10000,1)
print('processing %s values...' % len(timevals))
t1 = time.clock()
dates =\
num2date(timevals,units=units,calendar=calendar,only_use_cftime_datetimes=True)
t2 = time.clock()
t = t2-t1
print('num2date took %s seconds' % t)
timevals2 = date2num(dates,units=units,calendar=calendar)
t1 = time.clock()
t = t1-t2
print('date2num took %s seconds' % t)
test/test_cftime.py
View file @ 02d0fba7
from __future__ import print_function
import copy
import unittest
from collections import namedtuple
......@@ -8,11 +9,13 @@ import pytest
from numpy.testing import assert_almost_equal, assert_equal
from cftime import datetime as datetimex
from cftime import real_datetime
from cftime import (DateFromJulianDay, Datetime360Day, DatetimeAllLeap,
DatetimeGregorian, DatetimeJulian, DatetimeNoLeap,
DatetimeProlepticGregorian, JulianDayFromDate, _parse_date,
date2index, date2num, num2date, utime)
import cftime
# test cftime module for netCDF time <--> python datetime conversions.
dtime = namedtuple('dtime', ('values', 'units', 'calendar'))
......@@ -333,73 +336,104 @@ class cftimeTestCase(unittest.TestCase):
dateformat = '%Y-%m-%d %H:%M:%S'
dateref = datetime(2015,2,28,12)
ntimes = 1001
verbose = True # print out max error diagnostics
for calendar in calendars:
eps = 100.
units = 'microseconds since 1800-01-30 01:01:01'
eps = 10.
units = 'microseconds since 2000-01-30 01:01:01'
microsecs1 = date2num(dateref,units,calendar=calendar)
maxerr = 0
for n in range(ntimes):
microsecs1 += 1.
date1 = num2date(microsecs1, units, calendar=calendar)
microsecs2 = date2num(date1, units, calendar=calendar)
date2 = num2date(microsecs2, units, calendar=calendar)
err = np.abs(microsecs1 - microsecs2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
if verbose:
print('calender = %s max abs err (microsecs) = %s eps = %s' % \
(calendar,maxerr,eps))
units = 'milliseconds since 1800-01-30 01:01:01'
eps = 0.1
eps = 0.01
millisecs1 = date2num(dateref,units,calendar=calendar)
maxerr = 0.
for n in range(ntimes):
millisecs1 += 0.001
date1 = num2date(millisecs1, units, calendar=calendar)
millisecs2 = date2num(date1, units, calendar=calendar)
date2 = num2date(millisecs2, units, calendar=calendar)
err = np.abs(millisecs1 - millisecs2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
if verbose:
print('calender = %s max abs err (millisecs) = %s eps = %s' % \
(calendar,maxerr,eps))
eps = 1.e-4
units = 'seconds since 0001-01-30 01:01:01'
secs1 = date2num(dateref,units,calendar=calendar)
maxerr = 0.
for n in range(ntimes):
secs1 += 0.1
date1 = num2date(secs1, units, calendar=calendar)
secs2 = date2num(date1, units, calendar=calendar)
date2 = num2date(secs2, units, calendar=calendar)
err = np.abs(secs1 - secs2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
eps = 1.e-5
if verbose:
print('calender = %s max abs err (secs) = %s eps = %s' % \
(calendar,maxerr,eps))
eps = 1.e-6
units = 'minutes since 0001-01-30 01:01:01'
mins1 = date2num(dateref,units,calendar=calendar)
maxerr = 0.
for n in range(ntimes):
mins1 += 0.01
date1 = num2date(mins1, units, calendar=calendar)
mins2 = date2num(date1, units, calendar=calendar)
date2 = num2date(mins2, units, calendar=calendar)
err = np.abs(mins1 - mins2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
eps = 1.e-5
if verbose:
print('calender = %s max abs err (mins) = %s eps = %s' % \
(calendar,maxerr,eps))
eps = 1.e-7
units = 'hours since 0001-01-30 01:01:01'
hrs1 = date2num(dateref,units,calendar=calendar)
maxerr = 0.
for n in range(ntimes):
hrs1 += 0.001
date1 = num2date(hrs1, units, calendar=calendar)
hrs2 = date2num(date1, units, calendar=calendar)
date2 = num2date(hrs2, units, calendar=calendar)
err = np.abs(hrs1 - hrs2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
eps = 1.e-5
if verbose:
print('calender = %s max abs err (hours) = %s eps = %s' % \
(calendar,maxerr,eps))
eps = 1.e-9
units = 'days since 0001-01-30 01:01:01'
days1 = date2num(dateref,units,calendar=calendar)
maxerr = 0.
for n in range(ntimes):
days1 += 0.00001
date1 = num2date(days1, units, calendar=calendar)
days2 = date2num(date1, units, calendar=calendar)
date2 = num2date(days2, units, calendar=calendar)
err = np.abs(days1 - days2)
maxerr = max(err,maxerr)
assert(err < eps)
assert(date1.strftime(dateformat) == date2.strftime(dateformat))
if verbose:
print('calender = %s max abs err (days) = %s eps = %s' % \
(calendar,maxerr,eps))
# issue 353
assert (num2date(0, 'hours since 2000-01-01 0') ==
......@@ -468,7 +502,7 @@ class cftimeTestCase(unittest.TestCase):
pass
# this should not fail (year zero allowed in 'fake' calendars)
t = date2num(datetime(1, 1, 1), units, calendar='360_day')
self.assertEqual(t, 360)
self.assertAlmostEqual(t,360)
d = num2date(t, units, calendar='360_day')
self.assertEqual(d, Datetime360Day(1,1,1))
d = num2date(0, units, calendar='360_day')
......@@ -561,6 +595,76 @@ class cftimeTestCase(unittest.TestCase):
n = date2num(utc_date, units, calendar="julian")
# n should always be 0 as all units refer to the same point in time
assert_almost_equal(n, 0)
# cftime issue #49
d = DateFromJulianDay(2450022.5, "standard")
assert (d.year == 1995)
assert (d.month == 11)
assert (d.day == 1)
assert (d.hour == 0)
assert (d.minute == 0)
assert (d.second == 0)
# cftime issue #52
d = DateFromJulianDay(1684958.5,calendar='gregorian')
assert (d.year == -100)
assert (d.month == 3)
assert (d.day == 2)
assert (d.hour == 0)
assert (d.minute == 0)
assert (d.second == 0)
d = DateFromJulianDay(1684958.5,calendar='standard')
assert (d.year == -100)
assert (d.month == 3)
assert (d.day == 2)
assert (d.hour == 0)
assert (d.minute == 0)
assert (d.second == 0)
# test dayofwk, dayofyr attribute setting (cftime issue #13)
d1 = DatetimeGregorian(2020,2,29)
d2 = real_datetime(2020,2,29)
assert (d1.dayofwk == d2.dayofwk == 5)
assert (d1.dayofyr == d2.dayofyr == 60)
d1 = DatetimeGregorian(2020,2,29,23,59,59)
d2 = real_datetime(2020,2,29,23,59,59)
assert (d1.dayofwk == d2.dayofwk == 5)
assert (d1.dayofyr == d2.dayofyr == 60)
d1 = DatetimeGregorian(2020,2,28,23,59,59)
d2 = real_datetime(2020,2,28,23,59,59)
assert (d1.dayofwk == d2.dayofwk == 4)
assert (d1.dayofyr == d2.dayofyr == 59)
d1 = DatetimeGregorian(1700,1,1)
d2 = real_datetime(1700,1,1)
assert (d1.dayofwk == d2.dayofwk == 4)
assert (d1.dayofyr == d2.dayofyr == 1)
# last day of Julian Calendar (Thursday)
d1 = DatetimeJulian(1582, 10, 4, 12)
d2 = DatetimeGregorian(1582, 10, 4, 12)
assert (d1.dayofwk == d2.dayofwk == 3)
assert (d1.dayofyr == d2.dayofyr == 277)
# Monday in proleptic gregorian calendar
d1 = DatetimeProlepticGregorian(1582, 10, 4, 12)
d2 = real_datetime(1582,10,4,12)
assert (d1.dayofwk == d2.dayofwk == 0)
assert (d1.dayofyr == d2.dayofyr == 277)
# issue 71: negative reference years
# https://coastwatch.pfeg.noaa.gov/erddap/convert/time.html
# gives 2446433 (365 days more - is it counting year 0?)
# however http://aa.usno.navy.mil/data/docs/JulianDate.php gives
# 2446068, which agrees with us
units = "days since -4713-01-01T00:00:00Z"
t = date2num(datetime(1985,1,2), units, calendar="standard")
assert_almost_equal(t, 2446068)
# issue #68: allow months since for 360_day calendar
d = num2date(1, 'months since 0000-01-01 00:00:00', calendar='360_day')
self.assertEqual(d, Datetime360Day(0,2,1))
t = date2num(d, 'months since 0000-01-01 00:00:00', calendar='360_day')
self.assertEqual(t, 1)
# check that exception is raised if 'months since' used with
# anything but the 360_day calendar.
self.assertRaises(ValueError, num2date, \
1, 'months since 01-01-01',calendar='standard')
self.assertRaises(ValueError, utime, \
'months since 01-01-01', calendar='standard')
class TestDate2index(unittest.TestCase):
......@@ -745,7 +849,6 @@ class TestDate2index(unittest.TestCase):
# calculation of nearest index when sum of adjacent
# time values won't fit in 32 bits.
query_time = datetime(2037, 1, 3, 21, 12)
print(self.time_vars['time3'])
index = date2index(query_time, self.time_vars['time3'],
select='nearest')
assert(index == 11)
......@@ -775,8 +878,9 @@ class issue584TestCase(unittest.TestCase):
converter = self.converters["noleap"]
# Pick the date corresponding to the Julian day of 1.0 to test
# the transision from positive to negative Julian days.
# the transition from positive to negative Julian days.
julian_day = converter.date2num(datetimex(-4712, 1, 2, 12))
# should be a Tuesday
old_date = converter.num2date(julian_day)
for delta_year in range(1, 101): # 100 years cover several 7-year cycles
......@@ -1097,8 +1201,8 @@ def days_per_month_leap_year(date_type, month):
def test_zero_year(date_type):
# Year 0 is valid in the 360 day calendar
if date_type is Datetime360Day:
# Year 0 is valid in the 360,365 and 366 day calendars
if date_type in [DatetimeNoLeap, DatetimeAllLeap, Datetime360Day]:
date_type(0, 1, 1)
else:
with pytest.raises(ValueError):
......@@ -1251,9 +1355,11 @@ def test_num2date_only_use_cftime_datetimes_post_gregorian(
def test_repr():
expected = 'cftime.datetime(2000, 1, 1, 0, 0, 0, 0, -1, 1)'
# dayofwk, dayofyr not set
assert repr(datetimex(2000, 1, 1)) == expected
expected = 'cftime.DatetimeGregorian(2000, 1, 1, 0, 0, 0, 0, -1, 1)'
expected = 'cftime.DatetimeGregorian(2000, 1, 1, 0, 0, 0, 0, 5, 1)'
# dayofwk, dayofyr are set
assert repr(DatetimeGregorian(2000, 1, 1)) == expected
......