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69 lines
1.8 KiB
69 lines
1.8 KiB
# $Id: datetime.py,v 1.1 2011-09-01 15:34:03 wirawan Exp $
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#
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# wpylib.datetime
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# Created: 20110901
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# Wirawan Purwanto
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#
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"""
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wpylib.datetime
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Frequently used date/time related tools.
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Do not confuse this with python's core datetime module, which
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is not being replaced by this module!
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"""
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import sys
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import time
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def date8():
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"""Returns a standard 8-digit representation of the current date."""
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return time.strftime("%Y%m%d")
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def time_diff(time1, time2):
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"""Returns the time difference (time1 - time2) in seconds."""
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from time import mktime
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return mktime(time1) - mktime(time2)
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def shift_time(t, dt, localtime=True):
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"""Shifts a time data by an amount in dt (specified in seconds)."""
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if isinstance(t, time.struct_time):
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t1 = time.mktime(t) + dt
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else:
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t1 = t + dt
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if localtime:
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return time.localtime(t1)
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else:
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return time.gmtime(t1)
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def utime_to_iso(t=None, local=True):
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"""Converts UNIX time (seconds since Epoch) to ISO-formatted time string.
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In order to ease time computation/conversion,
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we will use numeric TZ shift (+/-HH:MM) instead of
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letter TZ code (EDT, EST, GMT, etc).
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"""
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from time import time, localtime, gmtime, strftime, timezone
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if t == None:
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t = time()
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if local:
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tt = localtime(t)
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dtz = -timezone + tt.tm_isdst * 3600
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# hopefully dtz is divisible by 60
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# It would be silly for a gov't to make its time
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# differ by seconds to GMT!
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dsec = abs(dtz) % 60
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dmin = abs(dtz // 60) % 60
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dhr = dtz // 3600
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if dsec == 00:
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sdtz = " %+03d:%02d" % (dhr, dmin)
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else:
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sdtz = " %+03d:%02d:%02d" % (dhr, dmin, dsec)
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else:
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tt = gmtime(t)
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sdtz = " +00:00"
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# Numeric timezone offset is created by hand
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# because I don't want to use %Z, nor do I want to use
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# "%z" (which did not work in python)
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return strftime("%Y-%m-%d %H:%M:%S", tt) + sdtz
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