use utcparse and datetime_to_epoch to handle slice 'expires' field
authorTony Mack <tmack@paris.CS.Princeton.EDU>
Mon, 26 Dec 2011 04:53:34 +0000 (23:53 -0500)
committerTony Mack <tmack@paris.CS.Princeton.EDU>
Mon, 26 Dec 2011 04:53:34 +0000 (23:53 -0500)

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