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93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
"""Parse a timezone specification."""
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# XXX Unfinished.
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# XXX Only the typical form "XXXhhYYY;ddd/hh,ddd/hh" is currently supported.
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tzpat = ('^([A-Z][A-Z][A-Z])([-+]?[0-9]+)([A-Z][A-Z][A-Z]);'
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'([0-9]+)/([0-9]+),([0-9]+)/([0-9]+)$')
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tzprog = None
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def tzparse(tzstr):
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"""Given a timezone spec, return a tuple of information
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(tzname, delta, dstname, daystart, hourstart, dayend, hourend),
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where 'tzname' is the name of the timezone, 'delta' is the offset
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in hours from GMT, 'dstname' is the name of the daylight-saving
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timezone, and 'daystart'/'hourstart' and 'dayend'/'hourend'
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specify the starting and ending points for daylight saving time."""
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global tzprog
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if tzprog is None:
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import re
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tzprog = re.compile(tzpat)
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match = tzprog.match(tzstr)
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if not match:
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raise ValueError, 'not the TZ syntax I understand'
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subs = []
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for i in range(1, 8):
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subs.append(match.group(i))
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for i in (1, 3, 4, 5, 6):
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subs[i] = eval(subs[i])
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[tzname, delta, dstname, daystart, hourstart, dayend, hourend] = subs
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return (tzname, delta, dstname, daystart, hourstart, dayend, hourend)
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def tzlocaltime(secs, params):
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"""Given a Unix time in seconds and a tuple of information about
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a timezone as returned by tzparse(), return the local time in the
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form (year, month, day, hour, min, sec, yday, wday, tzname)."""
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import time
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(tzname, delta, dstname, daystart, hourstart, dayend, hourend) = params
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year, month, days, hours, mins, secs, yday, wday, isdst = \
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time.gmtime(secs - delta*3600)
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if (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend):
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tzname = dstname
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hours = hours + 1
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return year, month, days, hours, mins, secs, yday, wday, tzname
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def tzset():
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"""Determine the current timezone from the "TZ" environment variable."""
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global tzparams, timezone, altzone, daylight, tzname
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import os
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tzstr = os.environ['TZ']
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tzparams = tzparse(tzstr)
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timezone = tzparams[1] * 3600
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altzone = timezone - 3600
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daylight = 1
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tzname = tzparams[0], tzparams[2]
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def isdst(secs):
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"""Return true if daylight-saving time is in effect for the given
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Unix time in the current timezone."""
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import time
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(tzname, delta, dstname, daystart, hourstart, dayend, hourend) = \
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tzparams
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year, month, days, hours, mins, secs, yday, wday, isdst = \
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time.gmtime(secs - delta*3600)
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return (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend)
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tzset()
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def localtime(secs):
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"""Get the local time in the current timezone."""
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return tzlocaltime(secs, tzparams)
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def test():
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from time import asctime, gmtime
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import time, sys
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now = time.time()
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x = localtime(now)
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tm = x[:-1] + (0,)
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print 'now =', now, '=', asctime(tm), x[-1]
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now = now - now % (24*3600)
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if sys.argv[1:]: now = now + eval(sys.argv[1])
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x = gmtime(now)
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tm = x[:-1] + (0,)
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print 'gmtime =', now, '=', asctime(tm), 'yday =', x[-2]
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jan1 = now - x[-2]*24*3600
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x = localtime(jan1)
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tm = x[:-1] + (0,)
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print 'jan1 =', jan1, '=', asctime(tm), x[-1]
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for d in range(85, 95) + range(265, 275):
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t = jan1 + d*24*3600
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x = localtime(t)
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tm = x[:-1] + (0,)
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print 'd =', d, 't =', t, '=', asctime(tm), x[-1]
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