Acessing the "time" Part of time_t Value

[Mike Copeland]

How do I mask out all but the _time_ components of a time_t value?
Specifically, I have the following:
time_t wTime = 1226764757;
I happen to know that this is November 16, 2008 @ 8:59:17, but I have
many other such items from which I want to use only the _time_ portion
(e.g. 8:59:17). How do I eliminate the "date" portions of either the
time_t value or the number I assign to it? TIA

 

[miso.liptak]

   How do I mask out all but the _time_ components of a time_t value?  
Specifically, I have the following:
        time_t wTime = 1226764757;
   I happen to know that this is November 16, 2008 @ 8:59:17, but I have
many other such items from which I want to use only the _time_ portion
(e.g. 8:59:17).  How do I eliminate the "date" portions of either the
time_t value or the number I assign to it?  TIA

Is number of seconds since midnight what you want? time(0) % 86400?
m.

 

[James Kanze]

On Nov 20, 8:03 am, (e-mail address removed) (Mike Copeland) wrote:

Is number of seconds since midnight what you want? time(0) %
86400?

That depends on how precise and how portable you have to be.
Not all days have exactly 86400 seconds, and time_t can be any
numeric type, with any representation---if it uses the
representation that was current in MS-DOS, your results are
meaningless, and if it is a double, your solution won't even
compile. (But for a lot of uses, it's adequate. It's what I
currently do---but in my case, even if I'm a minute or so off,
it's no big deal, and I only have to support
Unix-likes---Solaris and Linux.)