Time conversion in C

This is all in C:

I have 2 time values:

System time and an input from the user.

1) System time is in the form of seconds from 1/1/1970 calculated by
using

time_t secs;
SYSTEMTIME stime;

time(&secs);

2) The input from the user is in form hr:min:sec which is a string
value.

But the seperate values have been obtained by using

sscanf(storedTimeValue, "%d:%d:%d", &hour,&minutes,&seconds);

So now I have 3 integer values for hour,minutes and seconds.

3) I have a function which calculates the time difference between 2
time values,
but both these time values need to be seconds from 1/1/1970.

Is there any way by which,I could convert the user given time into time
in seconds from 1/1/1970,
so that I can get the difference between the system time and the user
given time.

.

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