[Tfug] A sense of time

[jblais]

> -----Original Message-----
> From: tfug-bounces at tfug.org [mailto:tfug-bounces at tfug.org]On Behalf Of
> Bexley Hall
> Sent: Thursday, August 02, 2007 4:05 PM
> To: tfug at tfug.org
> Subject: [Tfug] A sense of time
>
>
> Hi,
>
> I've periodically posted this question (or variations
> thereof) in a number of different forums.  Obviously,
> never quite happy with the answer(s) I've received
> (I suspect it is yet another unsolvable problem  :< )
>
> The issue is tracking calendar time in a system
> that exposes it (in a variety of forms) to the user.
> And, where that user is capable of "changing" the
> "current time".


How about every time the user sets the time, you write a sync time --
battery time vs cpu ticks - to a file.
Whenever the machine boots, look at the battery saved time and adjust the
sync file/time.
You define your events in terms of cpu cycles & cpu cycle counter wraps (a
little ways beyond base 10 counting).
When it's 10:02:13.1234 and  10897132691287 cpu ticks, and an event is
defined for 12:00, it might equate to an alarm time of 1 wrap + 8723986
ticks.  So that's the effective alarm time.  If the user changes his display
clock so he won't be late, the problem becomes: did he mean to set the alarm
for lunch, or when the sun was high?  He might change his lunch schedule,
but can't affect the sun.

joe