Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 1 | # Parse a timezone specification. |
| 2 | # XXX Unfinished. |
| 3 | # XXX Only the typical form "XXXhhYYY;ddd/hh,ddd/hh" is currently supported. |
| 4 | |
Guido van Rossum | 9694fca | 1997-10-22 21:00:49 +0000 | [diff] [blame] | 5 | tzpat = ('^([A-Z][A-Z][A-Z])([-+]?[0-9]+)([A-Z][A-Z][A-Z]);' |
| 6 | '([0-9]+)/([0-9]+),([0-9]+)/([0-9]+)$') |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 7 | |
| 8 | tzprog = None |
| 9 | |
| 10 | def tzparse(tzstr): |
| 11 | global tzprog |
| 12 | if tzprog == None: |
Guido van Rossum | 9694fca | 1997-10-22 21:00:49 +0000 | [diff] [blame] | 13 | import re |
| 14 | tzprog = re.compile(tzpat) |
| 15 | match = tzprog.match(tzstr) |
| 16 | if not match: |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 17 | raise ValueError, 'not the TZ syntax I understand' |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 18 | subs = [] |
| 19 | for i in range(1, 8): |
Guido van Rossum | 9694fca | 1997-10-22 21:00:49 +0000 | [diff] [blame] | 20 | subs.append(match.group(i)) |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 21 | for i in (1, 3, 4, 5, 6): |
| 22 | subs[i] = eval(subs[i]) |
| 23 | [tzname, delta, dstname, daystart, hourstart, dayend, hourend] = subs |
| 24 | return (tzname, delta, dstname, daystart, hourstart, dayend, hourend) |
| 25 | |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 26 | def tzlocaltime(secs, params): |
| 27 | import time |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 28 | (tzname, delta, dstname, daystart, hourstart, dayend, hourend) = params |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 29 | year, month, days, hours, mins, secs, yday, wday, isdst = \ |
| 30 | time.gmtime(secs - delta*3600) |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 31 | if (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend): |
| 32 | tzname = dstname |
| 33 | hours = hours + 1 |
| 34 | return year, month, days, hours, mins, secs, yday, wday, tzname |
| 35 | |
| 36 | def tzset(): |
| 37 | global tzparams, timezone, altzone, daylight, tzname |
| 38 | import os |
| 39 | tzstr = os.environ['TZ'] |
| 40 | tzparams = tzparse(tzstr) |
| 41 | timezone = tzparams[1] * 3600 |
Guido van Rossum | e7113b6 | 1993-03-29 11:30:50 +0000 | [diff] [blame] | 42 | altzone = timezone - 3600 |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 43 | daylight = 1 |
| 44 | tzname = tzparams[0], tzparams[2] |
| 45 | |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 46 | def isdst(secs): |
| 47 | import time |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 48 | (tzname, delta, dstname, daystart, hourstart, dayend, hourend) = \ |
| 49 | tzparams |
Guido van Rossum | 9b3bc71 | 1993-06-20 21:02:22 +0000 | [diff] [blame] | 50 | year, month, days, hours, mins, secs, yday, wday, isdst = \ |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 51 | time.gmtime(secs - delta*3600) |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 52 | return (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend) |
| 53 | |
| 54 | tzset() |
| 55 | |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 56 | def localtime(secs): |
| 57 | return tzlocaltime(secs, tzparams) |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 58 | |
| 59 | def test(): |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 60 | from time import asctime, gmtime |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 61 | import time, sys |
| 62 | now = time.time() |
| 63 | x = localtime(now) |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 64 | tm = x[:-1] + (0,) |
| 65 | print 'now =', now, '=', asctime(tm), x[-1] |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 66 | now = now - now % (24*3600) |
| 67 | if sys.argv[1:]: now = now + eval(sys.argv[1]) |
| 68 | x = gmtime(now) |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 69 | tm = x[:-1] + (0,) |
| 70 | print 'gmtime =', now, '=', asctime(tm), 'yday =', x[-2] |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 71 | jan1 = now - x[-2]*24*3600 |
| 72 | x = localtime(jan1) |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 73 | tm = x[:-1] + (0,) |
| 74 | print 'jan1 =', jan1, '=', asctime(tm), x[-1] |
Guido van Rossum | 2db9135 | 1992-10-18 17:09:59 +0000 | [diff] [blame] | 75 | for d in range(85, 95) + range(265, 275): |
| 76 | t = jan1 + d*24*3600 |
| 77 | x = localtime(t) |
Guido van Rossum | 5cfa5df | 1993-06-23 09:30:50 +0000 | [diff] [blame] | 78 | tm = x[:-1] + (0,) |
| 79 | print 'd =', d, 't =', t, '=', asctime(tm), x[-1] |