Date: Tue, 10 Apr 2007 14:30:11 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, brian@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/usr.bin/touch touch.1 touch.c Message-ID: <20070410050011.GH91694@wantadilla.lemis.com> In-Reply-To: <20070409.222011.1689682576.imp@bsdimp.com> References: <20070409021942.C150B16A529@hub.freebsd.org> <20070409024826.553be564@dev.lan.Awfulhak.org> <20070410010510.GB61460@wantadilla.lemis.com> <20070409.222011.1689682576.imp@bsdimp.com>
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--OgApRN/oydYDdnYz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Monday, 9 April 2007 at 22:20:11 -0600, M. Warner Losh wrote: > In message: <20070410010510.GB61460@wantadilla.lemis.com> > "Greg 'groggy' Lehey" <grog@freebsd.org> writes: >> On Monday, 9 April 2007 at 2:48:26 -0700, Brian Somers wrote: >>> I don't understand what this means. File times are in UTC aren't >>> they? >> >> No, they're in time_t. But if you import files from other systems, >> you frequently get times which are off by some time zone offset. > > time_t is UTC, by definition (sadly, POSIX has enshrined a broken > definition of UTC as the time_t definition, but that's not important > right now). The definition of time_t is simply a number of seconds since a specified event. It's true that this event was the turn of the year/decade in UTC, but that doesn't make it UTC. Currently my time_t is 1176181168; that's not directly recognizable as any time zone. > It cannot be a localtime. Localtime conversion of time_t is done by > libc to print the local time. But libc also needs to convert time_t to UTC. >> The case in point is that when importing files from digital cameras > > FAT doesn't deal in time_t. It deals in 'local time' only, encoded in > a funky way. Right. And that's the largest part of the problem. > The rest of what you say is correct, but since there is much confusion > around time_t I thought I'd be pedantic. Nothing wrong with being pedantic :-) Greg -- See complete headers for address and phone numbers. --OgApRN/oydYDdnYz Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFGGxnbIubykFB6QiMRAp0tAJ90aHZyXkVBt5D3CIYk79UG1V8IxgCgj3zK RU2Q4Qa0R2XTJuZj6pnYyJ0= =eWtb -----END PGP SIGNATURE----- --OgApRN/oydYDdnYz--
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