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# Parse a timezone specification.
# XXX Unfinished.
# XXX Only the typical form "XXXhhYYY;ddd/hh,ddd/hh" is currently supported.
tzpat = '^\([A-Z][A-Z][A-Z]\)\([-+]?[0-9]+\)\([A-Z][A-Z][A-Z]\);' + \
'\([0-9]+\)/\([0-9]+\),\([0-9]+\)/\([0-9]+\)$'
tzprog = None
def tzparse(tzstr):
global tzprog
if tzprog == None:
import regex
tzprog = regex.compile(tzpat)
if not tzprog.match(tzstr):
raise ValueError, 'not the TZ syntax I understand'
regs = tzprog.regs
subs = []
for i in range(1, 8):
a, b = regs[i]
subs.append(tzstr[a:b])
for i in (1, 3, 4, 5, 6):
subs[i] = eval(subs[i])
[tzname, delta, dstname, daystart, hourstart, dayend, hourend] = subs
return (tzname, delta, dstname, daystart, hourstart, dayend, hourend)
def tzlocaltime(time, params):
import calendar
(tzname, delta, dstname, daystart, hourstart, dayend, hourend) = params
year, month, days, hours, mins, secs, yday, wday = \
calendar.gmtime(time - delta*3600)
if (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend):
tzname = dstname
hours = hours + 1
return year, month, days, hours, mins, secs, yday, wday, tzname
def tzset():
global tzparams, timezone, altzone, daylight, tzname
import os
tzstr = os.environ['TZ']
tzparams = tzparse(tzstr)
timezone = tzparams[1] * 3600
altzone = timezone - 3600
daylight = 1
tzname = tzparams[0], tzparams[2]
def isdst(time):
import calendar
(tzname, delta, dstname, daystart, hourstart, dayend, hourend) = \
tzparams
year, month, days, hours, mins, secs, yday, wday = \
calendar.gmtime(time - delta*3600)
return (daystart, hourstart) <= (yday+1, hours) < (dayend, hourend)
tzset()
def localtime(time):
return tzlocaltime(time, tzparams)
def test():
from calendar import asctime, gmtime
import time, sys
now = time.time()
x = localtime(now)
print 'now =', now, '=', asctime(x[:-1]), x[-1]
now = now - now % (24*3600)
if sys.argv[1:]: now = now + eval(sys.argv[1])
x = gmtime(now)
print 'gmtime =', now, '=', asctime(x), 'yday =', x[-2]
jan1 = now - x[-2]*24*3600
x = localtime(jan1)
print 'jan1 =', jan1, '=', asctime(x[:-1]), x[-1]
for d in range(85, 95) + range(265, 275):
t = jan1 + d*24*3600
x = localtime(t)
print 'd =', d, 't =', t, '=', asctime(x[:-1]), x[-1]
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