// UNNEEDED int get_timezones(char ***l);
// UNNEEDED bool timezone_is_valid(const char *name);
-// UNNEEDED clockid_t clock_boottime_or_monotonic(void);
+clockid_t clock_boottime_or_monotonic(void);
#define xstrftime(buf, fmt, tm) assert_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0)