"yesterdate" function?

[Arnold D. Robbins {EUCC}]

In article <19100001 at hpficad.HP.COM> mcr at hpficad.HP.COM (Matt Reprogle) writes:
>I need a way to get yesterday's date in YYMMDD format in a Unix script and put
>it in a file.   I don't want to write a C program implementing an entire
>calendar to do it. 
>
>Can anyone help?  

This is too hard to pass up.

	#include <time.h>
	#define ONEDAY	(24 * 60 * 60)	/* seconds in a day */

	main ()
	{
		long yesterday;
		struct tm* then;

		(void) time (& yesterday);
		yesterday -= ONEDAY;
		then = localtime (& yesterday);
		(void) printf ("%d%02d%02d\n", then->tm_year,
			then->tm_mon, then->tm_mday);
		return 0;
	}
-- 
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