Re: [time-nuts] How best to compute local time from GPS

2008-03-25 Thread Morris Odell
David Forbes asked: 2. If I have to store the time zone from the user's input, are the DST calculations reasonably straightforward these days? It's not too difficult and you get a nice refresher in modulo-7 arithmetic. I did it in AVR assembler recently although I didn't try to make it

Re: [time-nuts] How best to compute local time from GPS

2008-03-25 Thread Magnus Danielson
From: Matthew Smith [EMAIL PROTECTED] Subject: Re: [time-nuts] How best to compute local time from GPS Date: Tue, 25 Mar 2008 14:11:36 +1030 Message-ID: [EMAIL PROTECTED] Quoth David Forbes at 2008-03-25 13:37... ... 2. If I have to store the time zone from the user's input, are the DST

Re: [time-nuts] How best to compute local time from GPS

2008-03-25 Thread Bruce Griffiths
Magnus Danielson wrote: Quoth David Forbes at 2008-03-25 13:37... ... 2. If I have to store the time zone from the user's input, are the DST calculations reasonably straightforward these days? 3. What weird time zone operations should it support, such as 15 minute local offsets or

Re: [time-nuts] How best to compute local time from GPS

2008-03-25 Thread Mike S
At 11:07 PM 3/24/2008, David Forbes wrote... 2. If I have to store the time zone from the user's input, are the DST calculations reasonably straightforward these days? 3. What weird time zone operations should it support, such as 15 minute local offsets or oddball DST dates? 4. In general, is it

[time-nuts] How best to compute local time from GPS

2008-03-24 Thread David Forbes
O Time Nuts, I am working feverishly on the software for my new scope clock. This is a circuit board that drives a 3 oscilloscope tube with a rather good-looking display of numbers and letters, driven by an HC908 MPU and a hardware circle-drawing engine. The basic gizmo is shown here:

Re: [time-nuts] How best to compute local time from GPS

2008-03-24 Thread Matthew Smith
Quoth David Forbes at 2008-03-25 13:37... ... 2. If I have to store the time zone from the user's input, are the DST calculations reasonably straightforward these days? 3. What weird time zone operations should it support, such as 15 minute local offsets or oddball DST dates? The problem

Re: [time-nuts] How best to compute local time from GPS

2008-03-24 Thread Bruce Griffiths
David Forbes wrote: O Time Nuts, I am working feverishly on the software for my new scope clock. This is a circuit board that drives a 3 oscilloscope tube with a rather good-looking display of numbers and letters, driven by an HC908 MPU and a hardware circle-drawing engine. The basic

Re: [time-nuts] How best to compute local time from GPS

2008-03-24 Thread Hal Murray
1 Is there a reasonable way to determine the local time zone from the GPS sentences? None that I know of. But given that you have GPS you probably know where you are. If you had a map of the globe with the time zone boundaries drawn on it, you should be able to figure out which zone you