How to use 'how to calculate time in python' in Python

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def compute_time(is_hourly):
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    """Figure out the proper start and end time"""
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    utcnow = datetime.datetime.utcnow().replace(tzinfo=pytz.utc)
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    utcnow = utcnow.replace(minute=0, second=0, microsecond=0)
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    if is_hourly:
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        lasthour = utcnow - datetime.timedelta(minutes=60)
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        sts = lasthour.replace(minute=0)
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        ets = lasthour.replace(minute=59)
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    else:
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        yesterday = utcnow - datetime.timedelta(hours=24)
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        sts = yesterday.replace(hour=0)
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        ets = sts.replace(hour=23, minute=59)
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    return sts, ets

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def testTimeStuff():
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    print("-"*20)
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    print()
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    print("The GPS Epoch when everything began (1980, 1, 6, 0, 0, 0, leapSecs=0)")
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    (w, sow, d, sod) = gpsFromUTC(1980, 1, 6, 0, 0, 0, leapSecs=0)
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    print("**** week: %s, sow: %s, day: %s, sod: %s" % (w, sow, d, sod))
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    print("     and hopefully back:")
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    print("**** %s, %s, %s, %s, %s, %s\n" % UTCFromGps(w, sow, leapSecs=0))
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    print("The time of first Rollover of GPS week (1999, 8, 21, 23, 59, 47)")
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    (w, sow, d, sod) = gpsFromUTC(1999, 8, 21, 23, 59, 47)
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    print("**** week: %s, sow: %s, day: %s, sod: %s" % (w, sow, d, sod))
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    print("     and hopefully back:")
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    print("**** %s, %s, %s, %s, %s, %s\n" % UTCFromGps(w, sow, leapSecs=14))
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    print("Today is GPS week 1186, day 3, seems to run ok (2002, 10, 2, 12, 6, 13.56)")
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    (w, sow, d, sod) = gpsFromUTC(2002, 10, 2, 12, 6, 13.56)
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    print("**** week: %s, sow: %s, day: %s, sod: %s" % (w, sow, d, sod))
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    print("     and hopefully back:")
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    print("**** %s, %s, %s, %s, %s, %s\n" % UTCFromGps(w, sow))