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  1. #include <stdio.h>
  2. #include <time.h>
  3.  
  4. time_t testDatum(const char*d)
  5. {
  6. 	struct tm t={0};
  7. 	unsigned a,b,c;
  8. 	int n;
  9. 	if( 3!=sscanf(d,"%u.%u.%4u%n",&a,&b,&c,&n) || d[n]) return -1;
  10. 	t.tm_year = c-1900;
  11. 	t.tm_mon = b-1;
  12. 	t.tm_mday = a;
  13. 	return mktime(&t)!=(time_t)-1?t.tm_year==c-1900&&t.tm_mon==b-1&&t.tm_mday==a?mktime(&t):-1:-1;
  14. }
  15.  
  16. int main(void) {
  17. 	time_t t;
  18. 	puts((t=testDatum("1.1.1970"))==(time_t)-1?"?":ctime(&t));
  19. 	puts((t=testDatum("29.2.2016"))==(time_t)-1?"?":ctime(&t));
  20. 	puts((t=testDatum("29.2.2015"))==(time_t)-1?"?":ctime(&t));
  21. 	puts((t=testDatum("1.1.1970abc"))==(time_t)-1?"?":ctime(&t));
  22. 	puts((t=testDatum("1.1.197"))==(time_t)-1?"?":ctime(&t));
  23. 	puts((t=testDatum("31.4.1970"))==(time_t)-1?"?":ctime(&t));
  24. 	puts((t=testDatum("31.5.1970"))==(time_t)-1?"?":ctime(&t));
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0s 2244KB
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Thu Jan  1 00:00:00 1970

Mon Feb 29 00:00:00 2016

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Sun May 31 00:00:00 1970
https://ideone.com/FCkC02
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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