My tools of the trade for python programming.
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# $Id:,v 1.1 2011-09-01 15:34:03 wirawan Exp $
# wpylib.datetime
# Created: 20110901
# Wirawan Purwanto
Frequently used date/time related tools.
Do not confuse this with python's core datetime module, which
is not being replaced by this module!
import sys
import time
def date8():
"""Returns a standard 8-digit representation of the current date."""
return time.strftime("%Y%m%d")
def time_diff(time1, time2):
"""Returns the time difference (time1 - time2) in seconds."""
from time import mktime
return mktime(time1) - mktime(time2)
def shift_time(t, dt, localtime=True):
"""Shifts a time data by an amount in dt (specified in seconds)."""
if isinstance(t, time.struct_time):
t1 = time.mktime(t) + dt
t1 = t + dt
if localtime:
return time.localtime(t1)
return time.gmtime(t1)
def utime_to_iso(t, local=True):
"""Converts UNIX time (seconds since Epoch) to ISO-formatted time string.
In order to ease time computation/conversion,
we will use numeric TZ shift (+/-HH:MM) instead of
letter TZ code (EDT, EST, GMT, etc).
from time import localtime, gmtime, strftime, timezone
if local:
tt = localtime(t)
dtz = -timezone + tt.tm_isdst * 3600
# hopefully dtz is divisible by 60
# It would be silly for a gov't to make its time
# differ by seconds to GMT!
dsec = abs(dtz) % 60
dmin = abs(dtz // 60) % 60
dhr = dtz // 3600
if dsec == 00:
sdtz = " %+03d:%02d" % (dhr, dmin)
sdtz = " %+03d:%02d:%02d" % (dhr, dmin, dsec)
tt = gmtime(t)
sdtz = " +00:00"
# Numeric timezone offset is created by hand
# because I don't want to use %Z, nor do I want to use
# "%z" (which did not work in python)
return strftime("%Y-%m-%d %H:%M:%S", tt) + sdtz