Time/Date Calculations

[John Gibney]

Original to: all

I am trying to find any algorithms for doing date and time 
calculations using either TURBO C or Microsoft QuickBASIC. 
 

I know that C has the functions asctime, difftime, etc. but 
I would like to obtain the algorithms behind these procedures. 
 

If you are at all familiar with VAX/VMS, there are system 
services SYS$BINTIM and SYS$ASCTIM which will take ASCII 
strings and convert them to quadwords and vice-versa.  I 
would like to build some functions in C that would do 
something similar. 
 

Specifically, in QuickBASIC, I would like to take an ASCII 
string and convert it to a quadword, say, so that I can do 
arithmetic on it, and then convert it back to an ASCII 
string.  I also want to do this using C... I have a couple 
of projects in the works that need these functions. 
 

Any help you could provide would be most appreciated. 
 
 

John  :-) 
 

---
 * Origin: Southern Mail CBCS - An OZNET System (Opus 7:830/312)