#include hidden int __days_in_month(int, int); hidden int __month_to_secs(int, int); hidden long long __year_to_secs(long long, int *); hidden long long __tm_to_secs(const struct tm *); hidden const char *__tm_to_tzname(const struct tm *); hidden int __secs_to_tm(long long, struct tm *); hidden void __secs_to_zone(long long, int, int *, long *, long *, const char **); hidden const char *__strftime_fmt_1(char (*)[100], size_t *, int, const struct tm *, locale_t, int); extern hidden const char __utc[];