[maemo-developers] sensing change in System Clock using Qt

From: ibrahim ibrahim.ali at asgatech.com
Date: Sun Jan 31 09:41:50 EET 2010
Remi.Denis-Courmont at nokia.com wrote:
>    Hello,
> ----- Message d'origine -----
>> But the problem that can face me is the case when the user changes his
>> clock settings (i.e adjust phone's time to a different time). in this
>> case, the timer that has been set to some fixed duration can go wrong.
> As a general rule, delay measurements should be done with the monotonic clock, not the wall clock (the real-time clock). As far as I know, Qt timers already do so internally. But of course, your own code should never request and use the wall clock for time measurements.
I don't think I follow you! What do you mean by monotonic clock ? If I 
don't depend on the system's clock to get current time, where else can I 
get it from ?
Let me explain my problem again briefly, I want to know the current 
time, calculate some future durations  depending on it. Then I figure 
out the time left to the upcoming duration and set it as interval to a 
QTimer Object. But I'm afraid that user may change the system clock 
(adjust the clock) So that my preset time will be invalid.

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