c74b85d6a6068a83659363e83f4757843beae078
1 #
2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
3 # This module is free software, and you may redistribute it and/or modify
4 # under the same terms as Python, so long as this copyright message and
5 # disclaimer are retained in their original form.
6 #
7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
10 # POSSIBILITY OF SUCH DAMAGE.
11 #
12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
17 #
18 # $Id: date.py,v 1.15 2002-01-05 02:27:00 richard Exp $
20 __doc__ = """
21 Date, time and time interval handling.
22 """
24 import time, re, calendar
26 class Date:
27 '''
28 As strings, date-and-time stamps are specified with the date in
29 international standard format (yyyy-mm-dd) joined to the time
30 (hh:mm:ss) by a period ("."). Dates in this form can be easily compared
31 and are fairly readable when printed. An example of a valid stamp is
32 "2000-06-24.13:03:59". We'll call this the "full date format". When
33 Timestamp objects are printed as strings, they appear in the full date
34 format with the time always given in GMT. The full date format is
35 always exactly 19 characters long.
37 For user input, some partial forms are also permitted: the whole time
38 or just the seconds may be omitted; and the whole date may be omitted
39 or just the year may be omitted. If the time is given, the time is
40 interpreted in the user's local time zone. The Date constructor takes
41 care of these conversions. In the following examples, suppose that yyyy
42 is the current year, mm is the current month, and dd is the current day
43 of the month; and suppose that the user is on Eastern Standard Time.
45 "2000-04-17" means <Date 2000-04-17.00:00:00>
46 "01-25" means <Date yyyy-01-25.00:00:00>
47 "2000-04-17.03:45" means <Date 2000-04-17.08:45:00>
48 "08-13.22:13" means <Date yyyy-08-14.03:13:00>
49 "11-07.09:32:43" means <Date yyyy-11-07.14:32:43>
50 "14:25" means <Date yyyy-mm-dd.19:25:00>
51 "8:47:11" means <Date yyyy-mm-dd.13:47:11>
52 "." means "right now"
54 The Date class should understand simple date expressions of the form
55 stamp + interval and stamp - interval. When adding or subtracting
56 intervals involving months or years, the components are handled
57 separately. For example, when evaluating "2000-06-25 + 1m 10d", we
58 first add one month to get 2000-07-25, then add 10 days to get
59 2000-08-04 (rather than trying to decide whether 1m 10d means 38 or 40
60 or 41 days).
62 Example usage:
63 >>> Date(".")
64 <Date 2000-06-26.00:34:02>
65 >>> _.local(-5)
66 "2000-06-25.19:34:02"
67 >>> Date(". + 2d")
68 <Date 2000-06-28.00:34:02>
69 >>> Date("1997-04-17", -5)
70 <Date 1997-04-17.00:00:00>
71 >>> Date("01-25", -5)
72 <Date 2000-01-25.00:00:00>
73 >>> Date("08-13.22:13", -5)
74 <Date 2000-08-14.03:13:00>
75 >>> Date("14:25", -5)
76 <Date 2000-06-25.19:25:00>
77 '''
78 def __init__(self, spec='.', offset=0):
79 """Construct a date given a specification and a time zone offset.
81 'spec' is a full date or a partial form, with an optional
82 added or subtracted interval. Or a date 9-tuple.
83 'offset' is the local time zone offset from GMT in hours.
84 """
85 if type(spec) == type(''):
86 self.set(spec, offset=offset)
87 else:
88 y,m,d,H,M,S,x,x,x = spec
89 ts = calendar.timegm((y,m,d,H+offset,M,S,0,0,0))
90 self.year, self.month, self.day, self.hour, self.minute, \
91 self.second, x, x, x = time.gmtime(ts)
93 def applyInterval(self, interval):
94 ''' Apply the interval to this date
95 '''
96 t = (self.year + interval.year,
97 self.month + interval.month,
98 self.day + interval.day,
99 self.hour + interval.hour,
100 self.minute + interval.minute,
101 self.second + interval.second, 0, 0, 0)
102 self.year, self.month, self.day, self.hour, self.minute, \
103 self.second, x, x, x = time.gmtime(calendar.timegm(t))
105 def __add__(self, other):
106 """Add an interval to this date to produce another date."""
107 t = (self.year + other.sign * other.year,
108 self.month + other.sign * other.month,
109 self.day + other.sign * other.day,
110 self.hour + other.sign * other.hour,
111 self.minute + other.sign * other.minute,
112 self.second + other.sign * other.second, 0, 0, 0)
113 return Date(time.gmtime(calendar.timegm(t)))
115 # XXX deviates from spec to allow subtraction of dates as well
116 def __sub__(self, other):
117 """ Subtract:
118 1. an interval from this date to produce another date.
119 2. a date from this date to produce an interval.
120 """
121 if isinstance(other, Date):
122 # TODO this code will fall over laughing if the dates cross
123 # leap years, phases of the moon, ....
124 a = calendar.timegm((self.year, self.month, self.day, self.hour,
125 self.minute, self.second, 0, 0, 0))
126 b = calendar.timegm((other.year, other.month, other.day, other.hour,
127 other.minute, other.second, 0, 0, 0))
128 diff = a - b
129 if diff < 0:
130 sign = -1
131 diff = -diff
132 else:
133 sign = 1
134 S = diff%60
135 M = (diff/60)%60
136 H = (diff/(60*60))%60
137 if H>1: S = 0
138 d = (diff/(24*60*60))%30
139 if d>1: H = S = M = 0
140 m = (diff/(30*24*60*60))%12
141 if m>1: H = S = M = 0
142 y = (diff/(365*24*60*60))
143 if y>1: d = H = S = M = 0
144 return Interval((y, m, d, H, M, S), sign=sign)
145 t = (self.year - other.sign * other.year,
146 self.month - other.sign * other.month,
147 self.day - other.sign * other.day,
148 self.hour - other.sign * other.hour,
149 self.minute - other.sign * other.minute,
150 self.second - other.sign * other.second, 0, 0, 0)
151 return Date(time.gmtime(calendar.timegm(t)))
153 def __cmp__(self, other):
154 """Compare this date to another date."""
155 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
156 r = cmp(getattr(self, attr), getattr(other, attr))
157 if r: return r
158 return 0
160 def __str__(self):
161 """Return this date as a string in the yyyy-mm-dd.hh:mm:ss format."""
162 return '%4d-%02d-%02d.%02d:%02d:%02d'%(self.year, self.month, self.day,
163 self.hour, self.minute, self.second)
165 def pretty(self):
166 ''' print up the date date using a pretty format...
167 '''
168 return time.strftime('%e %B %Y', (self.year, self.month,
169 self.day, self.hour, self.minute, self.second, 0, 0, 0))
171 def set(self, spec, offset=0, date_re=re.compile(r'''
172 (((?P<y>\d\d\d\d)-)?((?P<m>\d\d)-(?P<d>\d\d))?)? # yyyy-mm-dd
173 (?P<n>\.)? # .
174 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # hh:mm:ss
175 (?P<o>.+)? # offset
176 ''', re.VERBOSE)):
177 ''' set the date to the value in spec
178 '''
179 m = date_re.match(spec)
180 if not m:
181 raise ValueError, _('Not a date spec: [[yyyy-]mm-dd].[[h]h:mm[:ss]]'
182 '[offset]')
183 info = m.groupdict()
185 # get the current date/time using the offset
186 y,m,d,H,M,S,x,x,x = time.gmtime(time.time())
188 # override year, month, day parts
189 if info['m'] is not None and info['d'] is not None:
190 m = int(info['m'])
191 d = int(info['d'])
192 if info['y'] is not None: y = int(info['y'])
193 H = M = S = 0
195 # override hour, minute, second parts
196 if info['H'] is not None and info['M'] is not None:
197 H = int(info['H']) - offset
198 M = int(info['M'])
199 S = 0
200 if info['S'] is not None: S = int(info['S'])
202 # now handle the adjustment of hour
203 ts = calendar.timegm((y,m,d,H,M,S,0,0,0))
204 self.year, self.month, self.day, self.hour, self.minute, \
205 self.second, x, x, x = time.gmtime(ts)
207 if info['o']:
208 self.applyInterval(Interval(info['o']))
210 def __repr__(self):
211 return '<Date %s>'%self.__str__()
213 def local(self, offset):
214 """Return this date as yyyy-mm-dd.hh:mm:ss in a local time zone."""
215 t = (self.year, self.month, self.day, self.hour + offset, self.minute,
216 self.second, 0, 0, 0)
217 self.year, self.month, self.day, self.hour, self.minute, \
218 self.second, x, x, x = time.gmtime(calendar.timegm(t))
220 def get_tuple(self):
221 return (self.year, self.month, self.day, self.hour, self.minute,
222 self.second, 0, 0, 0)
224 class Interval:
225 '''
226 Date intervals are specified using the suffixes "y", "m", and "d". The
227 suffix "w" (for "week") means 7 days. Time intervals are specified in
228 hh:mm:ss format (the seconds may be omitted, but the hours and minutes
229 may not).
231 "3y" means three years
232 "2y 1m" means two years and one month
233 "1m 25d" means one month and 25 days
234 "2w 3d" means two weeks and three days
235 "1d 2:50" means one day, two hours, and 50 minutes
236 "14:00" means 14 hours
237 "0:04:33" means four minutes and 33 seconds
239 Example usage:
240 >>> Interval(" 3w 1 d 2:00")
241 <Interval 22d 2:00>
242 >>> Date(". + 2d") - Interval("3w")
243 <Date 2000-06-07.00:34:02>
244 '''
245 def __init__(self, spec, sign=1):
246 """Construct an interval given a specification."""
247 if type(spec) == type(''):
248 self.set(spec)
249 else:
250 self.sign = sign
251 self.year, self.month, self.day, self.hour, self.minute, \
252 self.second = spec
254 def __cmp__(self, other):
255 """Compare this interval to another interval."""
256 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
257 r = cmp(getattr(self, attr), getattr(other, attr))
258 if r: return r
259 return 0
261 def __str__(self):
262 """Return this interval as a string."""
263 sign = {1:'+', -1:'-'}[self.sign]
264 l = [sign]
265 if self.year: l.append('%sy'%self.year)
266 if self.month: l.append('%sm'%self.month)
267 if self.day: l.append('%sd'%self.day)
268 if self.second:
269 l.append('%d:%02d:%02d'%(self.hour, self.minute, self.second))
270 elif self.hour or self.minute:
271 l.append('%d:%02d'%(self.hour, self.minute))
272 return ' '.join(l)
274 def set(self, spec, interval_re = re.compile('''
275 \s*
276 (?P<s>[-+])? # + or -
277 \s*
278 ((?P<y>\d+\s*)y)? # year
279 \s*
280 ((?P<m>\d+\s*)m)? # month
281 \s*
282 ((?P<w>\d+\s*)w)? # week
283 \s*
284 ((?P<d>\d+\s*)d)? # day
285 \s*
286 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # time
287 \s*
288 ''', re.VERBOSE)):
289 ''' set the date to the value in spec
290 '''
291 self.year = self.month = self.week = self.day = self.hour = \
292 self.minute = self.second = 0
293 self.sign = 1
294 m = interval_re.match(spec)
295 if not m:
296 raise ValueError, _('Not an interval spec: [+-] [#y] [#m] [#w] '
297 '[#d] [[[H]H:MM]:SS]')
299 info = m.groupdict()
300 for group, attr in {'y':'year', 'm':'month', 'w':'week', 'd':'day',
301 'H':'hour', 'M':'minute', 'S':'second'}.items():
302 if info[group] is not None:
303 setattr(self, attr, int(info[group]))
305 if self.week:
306 self.day = self.day + self.week*7
308 if info['s'] is not None:
309 self.sign = {'+':1, '-':-1}[info['s']]
311 def __repr__(self):
312 return '<Interval %s>'%self.__str__()
314 def pretty(self):
315 ''' print up the date date using one of these nice formats..
316 '''
317 if self.year or self.month > 2:
318 return None
319 if self.month or self.day > 13:
320 days = (self.month * 30) + self.day
321 if days > 28:
322 if int(days/30) > 1:
323 return _('%(number)s months')%{'number': int(days/30)}
324 else:
325 return _('1 month')
326 else:
327 return _('%(number)s weeks')%{'number': int(days/7)}
328 if self.day > 7:
329 return _('1 week')
330 if self.day > 1:
331 return _('%(number)s days')%{'number': self.day}
332 if self.day == 1 or self.hour > 12:
333 return _('yesterday')
334 if self.hour > 1:
335 return _('%(number)s hours')%{'number': self.hour}
336 if self.hour == 1:
337 if self.minute < 15:
338 return _('an hour')
339 quart = self.minute/15
340 if quart == 2:
341 return _('1 1/2 hours')
342 return _('1 %(number)s/4 hours')%{'number': quart}
343 if self.minute < 1:
344 return _('just now')
345 if self.minute == 1:
346 return _('1 minute')
347 if self.minute < 15:
348 return _('%(number)s minutes')%{'number': self.minute}
349 quart = int(self.minute/15)
350 if quart == 2:
351 return _('1/2 an hour')
352 return _('%(number)s/4 hour')%{'number': quart}
354 def get_tuple(self):
355 return (self.year, self.month, self.day, self.hour, self.minute,
356 self.second)
359 def test():
360 intervals = (" 3w 1 d 2:00", " + 2d", "3w")
361 for interval in intervals:
362 print '>>> Interval("%s")'%interval
363 print `Interval(interval)`
365 dates = (".", "2000-06-25.19:34:02", ". + 2d", "1997-04-17", "01-25",
366 "08-13.22:13", "14:25")
367 for date in dates:
368 print '>>> Date("%s")'%date
369 print `Date(date)`
371 sums = ((". + 2d", "3w"), (".", " 3w 1 d 2:00"))
372 for date, interval in sums:
373 print '>>> Date("%s") + Interval("%s")'%(date, interval)
374 print `Date(date) + Interval(interval)`
376 if __name__ == '__main__':
377 test()
379 #
380 # $Log: not supported by cvs2svn $
381 # Revision 1.14 2001/11/22 15:46:42 jhermann
382 # Added module docstrings to all modules.
383 #
384 # Revision 1.13 2001/09/18 22:58:37 richard
385 #
386 # Added some more help to roundu-admin
387 #
388 # Revision 1.12 2001/08/17 03:08:11 richard
389 # fixed prettification of intervals of 1 week
390 #
391 # Revision 1.11 2001/08/15 23:43:18 richard
392 # Fixed some isFooTypes that I missed.
393 # Refactored some code in the CGI code.
394 #
395 # Revision 1.10 2001/08/07 00:24:42 richard
396 # stupid typo
397 #
398 # Revision 1.9 2001/08/07 00:15:51 richard
399 # Added the copyright/license notice to (nearly) all files at request of
400 # Bizar Software.
401 #
402 # Revision 1.8 2001/08/05 07:46:12 richard
403 # Changed date.Date to use regular string formatting instead of strftime -
404 # win32 seems to have problems with %T and no hour... or something...
405 #
406 # Revision 1.7 2001/08/02 00:27:04 richard
407 # Extended the range of intervals that are pretty-printed before actual dates
408 # are displayed.
409 #
410 # Revision 1.6 2001/07/31 09:54:18 richard
411 # Fixed the 2.1-specific gmtime() (no arg) call in roundup.date. (Paul Wright)
412 #
413 # Revision 1.5 2001/07/29 07:01:39 richard
414 # Added vim command to all source so that we don't get no steenkin' tabs :)
415 #
416 # Revision 1.4 2001/07/25 04:09:34 richard
417 # Fixed offset handling (shoulda read the spec a little better)
418 #
419 # Revision 1.3 2001/07/23 07:56:05 richard
420 # Storing only marshallable data in the db - no nasty pickled class references.
421 #
422 # Revision 1.2 2001/07/22 12:09:32 richard
423 # Final commit of Grande Splite
424 #
425 # Revision 1.1 2001/07/22 11:58:35 richard
426 # More Grande Splite
427 #
428 #
429 # vim: set filetype=python ts=4 sw=4 et si