What does ->tm_mday for time mean?

Question

This is to save a filename as the current date. One of the lines of codes are as follows. I can't understand what the local->tm_mday means

The code is:

time_t my_time = time(NULL);
struct tm *local = localtime(&my_time);
 
day = local->tm_mday;            
month = local->tm_mon + 1;       
year = local->tm_year + 1900;

`tm_mday` is day of the month, as mentioned earlier in comment — Bonniu, Jan 11 '23 at 09:36
This question has already answers on a question about the difference between `.` and `->` ? lol ? — 463035818_is_not_an_ai, Jan 11 '23 at 10:21

score 4 · Answer 1 · answered Jan 11 '23 at 09:37

If you don't know what a struct member means, look at the documentation for that struct.

In this case that's tm, from <time.h> (or <ctime> in C++)

Member objects

int tm_mday day of the month – [1, 31]

That's different to

int tm_wday days since Sunday – [0, 6]
int tm_yday days since January 1 – [0, 365]

What does ->tm_mday for time mean?

1 Answers1