LATfunctions.py

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#!/usr/local/bin/python
#
#                               Copyright 2005
#                                     by
#                        The Board of Trustees of the
#                     Leland Stanford Junior University.
#                            All rights reserved.
#

__facility__ = "Online"
__abstract__ = "LAT-related useful functions"
__author__   = "S. Tuvi <Stuvi@SLAC.Stanford.edu> SLAC - GLAST LAT I&T/Online"
__date__     = "2005/12/20 00:00:00"
__updated__  = "$Date: 2006/04/27 02:07:28 $"
__version__  = "$Revision: 1.2 $"
__release__  = "$Name: HEAD $"
__credits__  = "SLAC"

import LICOS.copyright_SLAC

import datetime, calendar, time

LAT_EPOCH_datetime = calendar.timegm( time.strptime( '2001-01-01 00:00:00', '%Y-%m-%d %H:%M:%S' ) )

# define a utility function to convert a LAT timestamp to a datetime object
def utcfromtimestamp( secs, usecs ):
    # get floating-point seconds including the epoch
    tstamp = float( secs ) + ( float( usecs ) / 1000000.0 )  + LAT_EPOCH_datetime

    # return the corresponding datetime object
    return datetime.datetime.utcfromtimestamp( tstamp )

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