Re: AbsoluteTime and Daylight Saving Time
- To: mathgroup at smc.vnet.net
- Subject: [mg111759] Re: AbsoluteTime and Daylight Saving Time
- From: David Skulsky <edskulsky at gmail.com>
- Date: Thu, 12 Aug 2010 05:31:11 -0400 (EDT)
- References: <i3bd1u$pbm$1@smc.vnet.net>
On Aug 4, 2:48 am, David Skulsky <edskul... at gmail.com> wrote: > The Mathematica documentation states that "AbsoluteTime[] uses > whatever date and time have been set on your computer system. It > performs no corrections for time zones, daylight saving time, etc." > This statement confuses me. When I execute the following commands on > my machine (Mathematica 7 running under Mac OS 10.6.4) it appears that > AbsoluteTime is accounting for DST since the two AbsoluteTime commands > return the same value for times that differ by 1 hour (at the DST > transition). > > datestr = {"Day", "MonthNameShort", "Year", "Hour24", "Minute", > "SecondExact"}; > > AbsoluteTime[{"13 Mar 2016 02:00:00.000", datestr}] > 3666826800 > > AbsoluteTime[{"13 Mar 2016 03:00:00.000", datestr}] > 3666826800 > > So I thought I'd try to specify the time zone using the TimeZone->0 > option in the AbsoluteTime command, but that didn't appear to solve > the problem (i.e., both calls to AbsoluteTime still return the same > value, though it differs from the previous calls to AbsoluteTime by > the offset associated with my local time zone). I thought that > specifying the time zone would remove any compensation for DST, since > DST seems to be accounted for by adjusting the time zone. > > Can somebody help me understand what's going on? > > Thanks, > > David Skulsky I just wanted to mention that I asked Wolfram Tech Support about this and they confirmed that this is a bug in the Macintosh version of Mathematica. David