Kurt Kuzba wrote in a message to Eric Cartmel:

 KK>    You need a function to adjust the data.
 KK>    You could write one easily, or you could convert the struct   
 KK> to a time_t variable using the standard function mktime(),    add
 KK> the seconds to that, and convert the time_t variable to    a struct
 KK> tm using the standard localtime() function.

Not necessary; mktime() adjusts the ranges of the tm structure it is
passed. I keep wondering why so many people make things so difficult, when
they are so easy :-)

(BTW: your code assumed time_t is expressed in seconds; this is not
guaranteed, hence the need for difftime())

greetings,
Tom
tomtorfs{at}village.uunet.be

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