dysize(3) Library Functions Manual dysize(3) dysize - (libc -lc) #include int dysize(int year); glibc ( feature_test_macros(7)): dysize(): glibc 2.19: _DEFAULT_SOURCE glibc 2.19 : _BSD_SOURCE || _SVID_SOURCE 365 366 . : (year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0) __isleap(year) . attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |dysize() | | MT-Safe | +------------+------------------------------------+--------------------+ . SunOS 4.x. . . strftime(3) 3 . . : . 6.18 8 2026 dysize(3)