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annotate Lib/tzparse.py @ 15842:f6cd36498a50 legacy-trunk

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author Martin v. Löwis <martin@v.loewis.de>
date Sat, 13 Jan 2001 09:54:41 +0000
parents 785155e2cfca
children 3dd217fbdd59
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1 """Parse a timezone specification."""
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2
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3 # XXX Unfinished.
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4 # XXX Only the typical form "XXXhhYYY;ddd/hh,ddd/hh" is currently supported.
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5
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6 tzpat = ('^([A-Z][A-Z][A-Z])([-+]?[0-9]+)([A-Z][A-Z][A-Z]);'
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7 '([0-9]+)/([0-9]+),([0-9]+)/([0-9]+)$')
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8
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9 tzprog = None
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10
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11 def tzparse(tzstr):
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12 """Given a timezone spec, return a tuple of information
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13 (tzname, delta, dstname, daystart, hourstart, dayend, hourend),
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14 where 'tzname' is the name of the timezone, 'delta' is the offset
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15 in hours from GMT, 'dstname' is the name of the daylight-saving
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16 timezone, and 'daystart'/'hourstart' and 'dayend'/'hourend'
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17 specify the starting and ending points for daylight saving time."""
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18 global tzprog
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19 if tzprog is None:
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20 import re
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21 tzprog = re.compile(tzpat)
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22 match = tzprog.match(tzstr)
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23 if not match:
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24 raise ValueError, 'not the TZ syntax I understand'
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25 subs = []
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26 for i in range(1, 8):
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27 subs.append(match.group(i))
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28 for i in (1, 3, 4, 5, 6):
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29 subs[i] = eval(subs[i])
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30 [tzname, delta, dstname, daystart, hourstart, dayend, hourend] = subs
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31 return (tzname, delta, dstname, daystart, hourstart, dayend, hourend)
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32
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33 def tzlocaltime(secs, params):
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34 """Given a Unix time in seconds and a tuple of information about
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35 a timezone as returned by tzparse(), return the local time in the
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36 form (year, month, day, hour, min, sec, yday, wday, tzname)."""
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37 import time
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38 (tzname, delta, dstname, daystart, hourstart, dayend, hourend) = params
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39 year, month, days, hours, mins, secs, yday, wday, isdst = \
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40 time.gmtime(secs - delta*3600)
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41 if (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend):
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42 tzname = dstname
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43 hours = hours + 1
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44 return year, month, days, hours, mins, secs, yday, wday, tzname
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45
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46 def tzset():
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47 """Determine the current timezone from the "TZ" environment variable."""
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48 global tzparams, timezone, altzone, daylight, tzname
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49 import os
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50 tzstr = os.environ['TZ']
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51 tzparams = tzparse(tzstr)
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52 timezone = tzparams[1] * 3600
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53 altzone = timezone - 3600
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54 daylight = 1
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55 tzname = tzparams[0], tzparams[2]
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56
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57 def isdst(secs):
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58 """Return true if daylight-saving time is in effect for the given
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59 Unix time in the current timezone."""
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60 import time
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61 (tzname, delta, dstname, daystart, hourstart, dayend, hourend) = \
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62 tzparams
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63 year, month, days, hours, mins, secs, yday, wday, isdst = \
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64 time.gmtime(secs - delta*3600)
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65 return (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend)
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66
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67 tzset()
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68
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69 def localtime(secs):
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70 """Get the local time in the current timezone."""
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71 return tzlocaltime(secs, tzparams)
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72
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73 def test():
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74 from time import asctime, gmtime
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75 import time, sys
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76 now = time.time()
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77 x = localtime(now)
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78 tm = x[:-1] + (0,)
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79 print 'now =', now, '=', asctime(tm), x[-1]
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80 now = now - now % (24*3600)
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81 if sys.argv[1:]: now = now + eval(sys.argv[1])
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82 x = gmtime(now)
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83 tm = x[:-1] + (0,)
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84 print 'gmtime =', now, '=', asctime(tm), 'yday =', x[-2]
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85 jan1 = now - x[-2]*24*3600
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86 x = localtime(jan1)
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87 tm = x[:-1] + (0,)
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88 print 'jan1 =', jan1, '=', asctime(tm), x[-1]
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89 for d in range(85, 95) + range(265, 275):
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90 t = jan1 + d*24*3600
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91 x = localtime(t)
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92 tm = x[:-1] + (0,)
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93 print 'd =', d, 't =', t, '=', asctime(tm), x[-1]