I am using mktime to convert the localtime value to timstamp. I am in CET zone, The returned string of the function localtime, it is correct, it matches with the date command in the shell. But the timestamp calculated by the mktime, i see it is 3 hours delayed regarding the string returned by date and localtime, why?
it is confuse .
thanks in advance,
Antonio
4  3144 
I don't have a complete answer, there are a couple of possibilities. First, localtime and date use different structures than mktime. Localtime uses a form based on UTC and mktime uses a structure that breaks UTC into seconds, minutes, hours, etc. I suspect the breakdown occurs between the conversion of UTC to mktime.
There is also a "pesky" timezone value that lies in the background (somewhere). Try "man -k zone" for more info. I believe date uses this value to adjust the UTC times to the correct local times.
What is odd is that you are off by 3 hours instead of just 1 hour (the difference between CET and UTC) or perhaps 2 hours with daylight savings.
Perhaps someone else has an insight to this issue.
hi,
I have another problem.. Linux does not seem to have a 64 bit equivalent for time_t , or mktime.. in windows we have.. -
__time64_t _mktime64(
-
struct tm *timeptr
-
);
-
The one lesson I have learned from windows is to not expect functions to work in both the windows and linux world, even if windows says its implementing a unix call. I have seen too many instances where function names are a tiny bit different and the same goes for parameters.
Hmmm, it almost like windows doesn't want you to easily port your code between platforms. Maybe we shouldn't go there.
As for UTC, I believe the 32 bit version will run out of seconds something in this century (does 2031 sound right?) I suspect before that happens, the unix world will switch from a 32 bit UTC to a 64 bit one. Maybe, windows is getting a jump start.
Its 2038.. y2k38 problem.. well for my application I have decided to use 32 bit one..
seems like i dnt have any option :)
Thnx and regards
Xoinki
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