SECSPERDAY
#define SECSPERDAY (24L * 60L * 60L)
#define SECSPERDAY (24 * SECSPERHOUR)
#define SECSPERDAY (24 * 60 * 60)
#define SECSPERDAY (24L * 60L * 60L)
#define SECSPERDAY 86400
#define SECSPERDAY (24L * 60L * 60L)