Increment a date by 1 day?

[fekkesh]

Hi
I have been trying to figure out how to increment a datetime by 1 day. For example 2009-03-31 13:00:00. I managed to write the following code, but I almost knew before I ran it what would happen. It icrements the day to 32 which does not exist obviously.

#include <stdio.h>
#include <time.h>

int main()
{

time_t currentTime;
time(&currentTime);
struct tm *ptm = localtime(&currentTime);
printf("%d\n",(ptm->tm_mday) +1);

return 0;
}

Is there a way to convert a datetime to unix timestamp, add 86400 seconds, convert back to datetime?

[tabstop]

Not tested, but you could add one to the tm_day member and run mktime (which I think is supposed to deal with odd things like the 32nd of January).

[QuantumPete]

You should be able to just add 86400 seconds to currentTime before you convert it to ptm. I haven't tested that yet though.

QuantumPete

[Salem]

As tabstop suggests, use mktime() on what you're doing at the moment, and it will automatically normalise the time for you.

So 32/01 becomes 01/02

[fekkesh]

OK! mktime fixed it. Thanks for helping!