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 1.10 2001-08-07 00:24:42 richard Exp $
20 import time, re, calendar
22 class Date:
23 '''
24 As strings, date-and-time stamps are specified with the date in
25 international standard format (yyyy-mm-dd) joined to the time
26 (hh:mm:ss) by a period ("."). Dates in this form can be easily compared
27 and are fairly readable when printed. An example of a valid stamp is
28 "2000-06-24.13:03:59". We'll call this the "full date format". When
29 Timestamp objects are printed as strings, they appear in the full date
30 format with the time always given in GMT. The full date format is
31 always exactly 19 characters long.
33 For user input, some partial forms are also permitted: the whole time
34 or just the seconds may be omitted; and the whole date may be omitted
35 or just the year may be omitted. If the time is given, the time is
36 interpreted in the user's local time zone. The Date constructor takes
37 care of these conversions. In the following examples, suppose that yyyy
38 is the current year, mm is the current month, and dd is the current day
39 of the month; and suppose that the user is on Eastern Standard Time.
41 "2000-04-17" means <Date 2000-04-17.00:00:00>
42 "01-25" means <Date yyyy-01-25.00:00:00>
43 "2000-04-17.03:45" means <Date 2000-04-17.08:45:00>
44 "08-13.22:13" means <Date yyyy-08-14.03:13:00>
45 "11-07.09:32:43" means <Date yyyy-11-07.14:32:43>
46 "14:25" means <Date yyyy-mm-dd.19:25:00>
47 "8:47:11" means <Date yyyy-mm-dd.13:47:11>
48 "." means "right now"
50 The Date class should understand simple date expressions of the form
51 stamp + interval and stamp - interval. When adding or subtracting
52 intervals involving months or years, the components are handled
53 separately. For example, when evaluating "2000-06-25 + 1m 10d", we
54 first add one month to get 2000-07-25, then add 10 days to get
55 2000-08-04 (rather than trying to decide whether 1m 10d means 38 or 40
56 or 41 days).
58 Example usage:
59 >>> Date(".")
60 <Date 2000-06-26.00:34:02>
61 >>> _.local(-5)
62 "2000-06-25.19:34:02"
63 >>> Date(". + 2d")
64 <Date 2000-06-28.00:34:02>
65 >>> Date("1997-04-17", -5)
66 <Date 1997-04-17.00:00:00>
67 >>> Date("01-25", -5)
68 <Date 2000-01-25.00:00:00>
69 >>> Date("08-13.22:13", -5)
70 <Date 2000-08-14.03:13:00>
71 >>> Date("14:25", -5)
72 <Date 2000-06-25.19:25:00>
73 '''
74 isDate = 1
76 def __init__(self, spec='.', offset=0):
77 """Construct a date given a specification and a time zone offset.
79 'spec' is a full date or a partial form, with an optional
80 added or subtracted interval. Or a date 9-tuple.
81 'offset' is the local time zone offset from GMT in hours.
82 """
83 if type(spec) == type(''):
84 self.set(spec, offset=offset)
85 else:
86 y,m,d,H,M,S,x,x,x = spec
87 ts = calendar.timegm((y,m,d,H+offset,M,S,0,0,0))
88 self.year, self.month, self.day, self.hour, self.minute, \
89 self.second, x, x, x = time.gmtime(ts)
91 def applyInterval(self, interval):
92 ''' Apply the interval to this date
93 '''
94 t = (self.year + interval.year,
95 self.month + interval.month,
96 self.day + interval.day,
97 self.hour + interval.hour,
98 self.minute + interval.minute,
99 self.second + interval.second, 0, 0, 0)
100 self.year, self.month, self.day, self.hour, self.minute, \
101 self.second, x, x, x = time.gmtime(calendar.timegm(t))
103 def __add__(self, other):
104 """Add an interval to this date to produce another date."""
105 t = (self.year + other.sign * other.year,
106 self.month + other.sign * other.month,
107 self.day + other.sign * other.day,
108 self.hour + other.sign * other.hour,
109 self.minute + other.sign * other.minute,
110 self.second + other.sign * other.second, 0, 0, 0)
111 return Date(time.gmtime(calendar.timegm(t)))
113 # XXX deviates from spec to allow subtraction of dates as well
114 def __sub__(self, other):
115 """ Subtract:
116 1. an interval from this date to produce another date.
117 2. a date from this date to produce an interval.
118 """
119 if other.isDate:
120 # TODO this code will fall over laughing if the dates cross
121 # leap years, phases of the moon, ....
122 a = calendar.timegm((self.year, self.month, self.day, self.hour,
123 self.minute, self.second, 0, 0, 0))
124 b = calendar.timegm((other.year, other.month, other.day, other.hour,
125 other.minute, other.second, 0, 0, 0))
126 diff = a - b
127 if diff < 0:
128 sign = -1
129 diff = -diff
130 else:
131 sign = 1
132 S = diff%60
133 M = (diff/60)%60
134 H = (diff/(60*60))%60
135 if H>1: S = 0
136 d = (diff/(24*60*60))%30
137 if d>1: H = S = M = 0
138 m = (diff/(30*24*60*60))%12
139 if m>1: H = S = M = 0
140 y = (diff/(365*24*60*60))
141 if y>1: d = H = S = M = 0
142 return Interval((y, m, d, H, M, S), sign=sign)
143 t = (self.year - other.sign * other.year,
144 self.month - other.sign * other.month,
145 self.day - other.sign * other.day,
146 self.hour - other.sign * other.hour,
147 self.minute - other.sign * other.minute,
148 self.second - other.sign * other.second, 0, 0, 0)
149 return Date(time.gmtime(calendar.timegm(t)))
151 def __cmp__(self, other):
152 """Compare this date to another date."""
153 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
154 r = cmp(getattr(self, attr), getattr(other, attr))
155 if r: return r
156 return 0
158 def __str__(self):
159 """Return this date as a string in the yyyy-mm-dd.hh:mm:ss format."""
160 return '%4d-%02d-%02d.%02d:%02d:%02d'%(self.year, self.month, self.day,
161 self.hour, self.minute, self.second)
163 def pretty(self):
164 ''' print up the date date using a pretty format...
165 '''
166 return time.strftime('%e %B %Y', (self.year, self.month,
167 self.day, self.hour, self.minute, self.second, 0, 0, 0))
169 def set(self, spec, offset=0, date_re=re.compile(r'''
170 (((?P<y>\d\d\d\d)-)?((?P<m>\d\d)-(?P<d>\d\d))?)? # yyyy-mm-dd
171 (?P<n>\.)? # .
172 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # hh:mm:ss
173 (?P<o>.+)? # offset
174 ''', re.VERBOSE)):
175 ''' set the date to the value in spec
176 '''
177 m = date_re.match(spec)
178 if not m:
179 raise ValueError, 'Not a date spec: [[yyyy-]mm-dd].[[h]h:mm[:ss]] [offset]'
180 info = m.groupdict()
182 # get the current date/time using the offset
183 y,m,d,H,M,S,x,x,x = time.gmtime(time.time())
185 # override year, month, day parts
186 if info['m'] is not None and info['d'] is not None:
187 m = int(info['m'])
188 d = int(info['d'])
189 if info['y'] is not None: y = int(info['y'])
190 H = M = S = 0
192 # override hour, minute, second parts
193 if info['H'] is not None and info['M'] is not None:
194 H = int(info['H']) - offset
195 M = int(info['M'])
196 S = 0
197 if info['S'] is not None: S = int(info['S'])
199 # now handle the adjustment of hour
200 ts = calendar.timegm((y,m,d,H,M,S,0,0,0))
201 self.year, self.month, self.day, self.hour, self.minute, \
202 self.second, x, x, x = time.gmtime(ts)
204 if info['o']:
205 self.applyInterval(Interval(info['o']))
207 def __repr__(self):
208 return '<Date %s>'%self.__str__()
210 def local(self, offset):
211 """Return this date as yyyy-mm-dd.hh:mm:ss in a local time zone."""
212 t = (self.year, self.month, self.day, self.hour + offset, self.minute,
213 self.second, 0, 0, 0)
214 self.year, self.month, self.day, self.hour, self.minute, \
215 self.second, x, x, x = time.gmtime(calendar.timegm(t))
217 def get_tuple(self):
218 return (self.year, self.month, self.day, self.hour, self.minute,
219 self.second, 0, 0, 0)
221 class Interval:
222 '''
223 Date intervals are specified using the suffixes "y", "m", and "d". The
224 suffix "w" (for "week") means 7 days. Time intervals are specified in
225 hh:mm:ss format (the seconds may be omitted, but the hours and minutes
226 may not).
228 "3y" means three years
229 "2y 1m" means two years and one month
230 "1m 25d" means one month and 25 days
231 "2w 3d" means two weeks and three days
232 "1d 2:50" means one day, two hours, and 50 minutes
233 "14:00" means 14 hours
234 "0:04:33" means four minutes and 33 seconds
236 Example usage:
237 >>> Interval(" 3w 1 d 2:00")
238 <Interval 22d 2:00>
239 >>> Date(". + 2d") - Interval("3w")
240 <Date 2000-06-07.00:34:02>
241 '''
242 isInterval = 1
244 def __init__(self, spec, sign=1):
245 """Construct an interval given a specification."""
246 if type(spec) == type(''):
247 self.set(spec)
248 else:
249 self.sign = sign
250 self.year, self.month, self.day, self.hour, self.minute, \
251 self.second = spec
253 def __cmp__(self, other):
254 """Compare this interval to another interval."""
255 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
256 r = cmp(getattr(self, attr), getattr(other, attr))
257 if r: return r
258 return 0
260 def __str__(self):
261 """Return this interval as a string."""
262 sign = {1:'+', -1:'-'}[self.sign]
263 l = [sign]
264 if self.year: l.append('%sy'%self.year)
265 if self.month: l.append('%sm'%self.month)
266 if self.day: l.append('%sd'%self.day)
267 if self.second:
268 l.append('%d:%02d:%02d'%(self.hour, self.minute, self.second))
269 elif self.hour or self.minute:
270 l.append('%d:%02d'%(self.hour, self.minute))
271 return ' '.join(l)
273 def set(self, spec, interval_re = re.compile('''
274 \s*
275 (?P<s>[-+])? # + or -
276 \s*
277 ((?P<y>\d+\s*)y)? # year
278 \s*
279 ((?P<m>\d+\s*)m)? # month
280 \s*
281 ((?P<w>\d+\s*)w)? # week
282 \s*
283 ((?P<d>\d+\s*)d)? # day
284 \s*
285 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # time
286 \s*
287 ''', re.VERBOSE)):
288 ''' set the date to the value in spec
289 '''
290 self.year = self.month = self.week = self.day = self.hour = \
291 self.minute = self.second = 0
292 self.sign = 1
293 m = interval_re.match(spec)
294 if not m:
295 raise ValueError, 'Not an interval spec: [+-] [#y] [#m] [#w] [#d] [[[H]H:MM]:SS]'
297 info = m.groupdict()
298 for group, attr in {'y':'year', 'm':'month', 'w':'week', 'd':'day',
299 'H':'hour', 'M':'minute', 'S':'second'}.items():
300 if info[group] is not None:
301 setattr(self, attr, int(info[group]))
303 if self.week:
304 self.day = self.day + self.week*7
306 if info['s'] is not None:
307 self.sign = {'+':1, '-':-1}[info['s']]
309 def __repr__(self):
310 return '<Interval %s>'%self.__str__()
312 def pretty(self, threshold=('d', 5)):
313 ''' print up the date date using one of these nice formats..
314 < 1 minute
315 < 15 minutes
316 < 30 minutes
317 < 1 hour
318 < 12 hours
319 < 1 day
320 otherwise, return None (so a full date may be displayed)
321 '''
322 if self.year or self.month > 2:
323 return None
324 if self.month:
325 days = (self.month * 30) + self.day
326 if days > 28:
327 return '%s months'%int(days/30)
328 else:
329 return '%s weeks'%int(days/7)
330 if self.day > 7:
331 return '%s weeks'%self.day
332 if self.day > 1:
333 return '%s days'%self.day
334 if self.day == 1 or self.hour > 12:
335 return 'yesterday'
336 if self.hour > 1:
337 return '%s hours'%self.hour
338 if self.hour == 1:
339 if self.minute < 15:
340 return 'an hour'
341 quart = self.minute/15
342 if quart == 2:
343 return '1 1/2 hours'
344 return '1 %s/4 hours'%quart
345 if self.minute < 1:
346 return 'just now'
347 if self.minute == 1:
348 return '1 minute'
349 if self.minute < 15:
350 return '%s minutes'%self.minute
351 quart = int(self.minute/15)
352 if quart == 2:
353 return '1/2 an hour'
354 return '%s/4 hour'%quart
356 def get_tuple(self):
357 return (self.year, self.month, self.day, self.hour, self.minute,
358 self.second)
361 def test():
362 intervals = (" 3w 1 d 2:00", " + 2d", "3w")
363 for interval in intervals:
364 print '>>> Interval("%s")'%interval
365 print `Interval(interval)`
367 dates = (".", "2000-06-25.19:34:02", ". + 2d", "1997-04-17", "01-25",
368 "08-13.22:13", "14:25")
369 for date in dates:
370 print '>>> Date("%s")'%date
371 print `Date(date)`
373 sums = ((". + 2d", "3w"), (".", " 3w 1 d 2:00"))
374 for date, interval in sums:
375 print '>>> Date("%s") + Interval("%s")'%(date, interval)
376 print `Date(date) + Interval(interval)`
378 if __name__ == '__main__':
379 test()
381 #
382 # $Log: not supported by cvs2svn $
383 # Revision 1.9 2001/08/07 00:15:51 richard
384 # Added the copyright/license notice to (nearly) all files at request of
385 # Bizar Software.
386 #
387 # Revision 1.8 2001/08/05 07:46:12 richard
388 # Changed date.Date to use regular string formatting instead of strftime -
389 # win32 seems to have problems with %T and no hour... or something...
390 #
391 # Revision 1.7 2001/08/02 00:27:04 richard
392 # Extended the range of intervals that are pretty-printed before actual dates
393 # are displayed.
394 #
395 # Revision 1.6 2001/07/31 09:54:18 richard
396 # Fixed the 2.1-specific gmtime() (no arg) call in roundup.date. (Paul Wright)
397 #
398 # Revision 1.5 2001/07/29 07:01:39 richard
399 # Added vim command to all source so that we don't get no steenkin' tabs :)
400 #
401 # Revision 1.4 2001/07/25 04:09:34 richard
402 # Fixed offset handling (shoulda read the spec a little better)
403 #
404 # Revision 1.3 2001/07/23 07:56:05 richard
405 # Storing only marshallable data in the db - no nasty pickled class references.
406 #
407 # Revision 1.2 2001/07/22 12:09:32 richard
408 # Final commit of Grande Splite
409 #
410 # Revision 1.1 2001/07/22 11:58:35 richard
411 # More Grande Splite
412 #
413 #
414 # vim: set filetype=python ts=4 sw=4 et si