C++ Question

[Doxie]

I got this question from a friend, anyone able to help?

I have 2 time values stored in tm structure. I need to know how many seconds are between. The only function for that seems to be difftime but it works with time_b values. Am i missing anything or is there really no library function that subtracts 2 values in tm format?

I got no idea

[SumTingWong]

I got this question from a friend, anyone able to help?

I got no idea

<{POST_SNAPBACK}>

Use mktime to convert your tm structs to time_t values and then difftime to calculate the difference.

mktime on MSDN

Use gmtime or localtime to convert time_t value back to tm struct

Edited December 29, 2004 by pacman

[Doxie]

His answer

I know - I went through this some time ago already. This limits me to years between 1970 and somewhere around 2040.

[SumTingWong]

His answer

I know - I went through this some time ago already. This limits me to years between 1970 and somewhere around 2040.

<{POST_SNAPBACK}>

Why did he ask for a way to subtract between 2 tm values?

If you want to go back further, use SYSTEMTIME which starts from January 1, 1601.