add the specified number of days to current date

[zon_cpp]

Hi! i use localtime function to get current time, in "tm struct". how do i get a new "tm struct" that adds the specified number of days to the value of this instance. this is similar with DateTime::AddDays, but i don't use any MFC Class.

time_t t;
struct tm * tt;
char buffer[50];
time(&t);
tt = localtime(&t);
int dayOfWeek = tt->tm_wday; // days since sunday
tt->tm_mday -= dayOfWeek;

in this code there is a bug. if tt->tm_mday < dayOfWeek then ??? please help me.

Zo.Naderi-Iran

[CPallini]

Why don't you add the proper number of seconds (1 day is 86400 secs) directly to the time_t variable? :)

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[zon_cpp]

oh, ok. thanks a lot, dear CPallini.

Zo.Naderi-Iran

[rahul kulshreshtha]

Another answer is To get system date: COleDateTime curDateTime; curDateTime = COleDateTime::GetCurrentTime(); COleDateTimeSpan represents a relative time, a time span. COleDateTimeSpan daySpan(25,0,0,0); 25 represents 25 days span. Next three zeros – hours, minutes, and seconds. Wanna get the date, 25 days from current date, add daySpan with curDateTime: COleDateTime comDateTime; comDateTime = curDateTime + daySpan; Also see CTime and CTimeSpan