FW: 64-bit time_t and tz file format
Olson, Arthur David (NCI)
olsona at dc37a.nci.nih.gov
Thu Jun 10 17:29:57 UTC 1999
From: alan perry [SMTP:esprit at jps.net]
Sent: Thursday, June 10, 1999 1:18 PM
To: tz at elsie.nci.nih.gov
Subject: 64-bit time_t and tz file format
A couple of days ago, I posted something to this list about how to
go about changing the tz file format to support a 64-bit time_t
value. I have heard nothing back.
I was looking through the tzcode to see if this problem has been
addressed already and found the following comment in the zic source.
> ** The tz file format currently allows at most 32-bit quantities.
> ** This restriction should be removed before signed 32-bit values
> ** wrap around in 2038, but unfortunately this will require a
> ** change to the tz file format.
So, has anyone been looking into this issue?
As I noted earlier, the current tz file format doesn't scale
well to a 64-bit time_t and all of the possible additional timezone
transitions that result from the addition years that can be
As OS vendors (including the one that I used to work for) consider
what to do with time_t when their OS adds 64-bit support and how
to deal with 2038, they might be tempted to come up with their own
solution if it doesn't get addressed by the elsie code.
More information about the tz