Date: Wed, 17 Nov 1999 15:01:24 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Myron Seto <myron_seto AT hotmail DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: Question(newbie): strptime alternative
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On Wed, 17 Nov 1999, Myron Seto wrote:

> const long secondsperday = (24 * 60 * 60);
[snip]
> printf("%d\n", (mktime(&second) - mktime(&first)) / secondsperday);

This is non-portable: you are assuming that time_t is in seconds.  While 
this is true in many libraries, it is not a good idea to rely on this.  
Use the difftime function instead.

> struct tm first, second;
> strptime("10/1/1972", "%x", &first)
> strptime("12/10/1999", "%x", &second)
> 
> for example, but djgpp compiler does not have strptime.  Can someone
> please suggest an alternative?

One alternative is to fill the fields of struct tm variables directly, or 
by using sscanf (if you must to begin with a string).