in reply to Re: Subtracting and Comparing Two Dates
in thread Subtracting and Comparing Two Dates

For my own clarification, what benefits are there to using Time::Local instead of POSIX. The functionality seems to be the same. Is implemetation different? Or is it just a preference thing?

Don
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Everything I've learned in life can be summed up in a small perl script!
  • Comment on Re^2: Subtracting and Comparing Two Dates

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Re^3: Subtracting and Comparing Two Dates
by ikegami (Patriarch) on Jan 08, 2007 at 23:11 UTC
    I don't see anything in POSIX similar to Time::Local's timegm. To which POSIX function were you refering?
[reply]
[d/l]
      timegm() in Time::Local == gmtime() in POSIX

      After looking it looks like Time::Local is a Pure Perl interface to the Perl localtime objects where POSIX is an XS interface to the system libraries.

      Don
      WHITEPAGES.COM | INC
      Everything I've learned in life can be summed up in a small perl script!
[reply]

        Not at all. Look at the arguments...

        FunctionPOSIX equivalentPurpose of Function
        CORE::gmtimePOSIX::gmtimeReturns GMT time components from epoch time.
        Time::Local::timegm[none]Returns the epoch time from GMT time components.
        CORE::localtimePOSIX::localtimeReturns local time components from epoch time.
        Time::Local::timelocalPOSIX::mktimeReturns the epoch time from local time components.

        POSIX is missing the very function that's needed here.

[reply]

        I'm not sure that's quite right... 

        sub gmtime {
    usage "gmtime(time)" if @_ != 1;
    CORE::gmtime($_[0]);
}

        [download]
        verses
        Read more... (3 kB)

        They seem to be different by a kilobyte or two. I noticed they both use CORE::gmtime() though.

        -Paul

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