Re: [Boost-users] Datetime: time_of_day and time_range concept

From: Andrey Tcherepanov (moyt63c02_at_[hidden])
Date: 2008-04-03 12:12:47

Createing some sort of schedulling is quite common task (well, at least  
for me), and this seems to be light but nice-to-have-out-of-the-box  
facility.

+1 from me, but lets hear from library authors first.

Thanks,
   Andrey

On Wed, 02 Apr 2008 01:51:30 -0600, Jean-Pierre Bergamin  
<james_at_[hidden]> wrote:

> Hello everyone
>
> While implementing a job scheduler that has to start jobs at specific  
> times
> (i.e. daily at 08:15) and during specific time ranges (every Monday  
> between
> 16:20 and 18:00), the need for two new concepts that represents a time
> (detached from a date) and a time range between two time_of_day came up.
> While time_duration almost fits these needs, there are some things that  
> we
> had to take into account:
>
> - A time_of_day must be normalized to only allow hours >= 0 && hours < 24
> - Only the substract operator makes sense to calculate the duration  
> between
> to times
>   (15:30 - 12:00 = 3 hours and 30 minutes). 12:20 + 15:32 does not make
> sense.
>
> The implicit conversion to time_duration also allows the usage of
> time_of_day to create ptime instances (which is IMHO more  
> "understandable"
> then using time_duration):
> ptime some_time(date(2008, 4, 1), time_of_day(14, 20, 0));
[snip]

> I think these concepts would fit well into the date time lib. What do you
> think?

> Regards
> James