🚀 go-pugleaf

ltf@ncmicro.lonestar.org (Lance Franklin) writes:
: In article <1992Jul16.145836.15586@avalon.nwc.navy.mil> dejesus@archimedes.nwc.navy.mil (Francisco X DeJesus) writes:
: }I realize that date/time-related questions are common here, so no flames
: ...

Many UNIX/ANSI systems have an even easier way to calculate relative dates,
using the mktime() function:

time_t mktime( struct tm * );

First you get a starting date (easiest with time() and localtime()):

time_t now;
struct tm t1;

time(&now);
t1 = *localtime( &now );

To get the date say 9 days from now:

t1->tm_mday += 9;
mktime( &t1 );

mktime() will accept values 'out of range' in the fields and adjust them -
so it deals nicely if you add 9 days to 29 June (for example). It's clean,
it's elegant, and you don't have to deal with leap years, days in the
month, or any math at all.

Be careful if you subtract, though. SCO UNIX's mktime() is buggy when
dealing with negative values in the struct tm.

I hope this answers your questions.

Michael
= Michael John Marshall - michael@xon.co.uk = B0ftg+k-s(+)h-r-
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