Re: AW: AW: Re: tinterval - operator problems on AIX

Pete Forman writes:
> One workaround would be to add 4*n to tm_year and subtract (365*4+1)
> *24*60*60*n from the time_t returned. (All leap years are multiples
> of 4 in the range 1901 to 2038. If tm_wday is wanted, that will need
> to be adjusted as well.)

FWIW, that should be to add 28*n to tm_year and subtract (365*4+1)*7
*24*60*60*n from the time_t returned. That calculates tm_wday
correctly.

Also I should have been more explicit that this applies only to AIX
and IRIX. Those return -1 from mktime(year < 1970) and do not allow
DST rules to vary from year to year. Linux and Solaris have more
capable date libraries.
--
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