- prototype in sys\types.h, sys\utime.h - path = any valid DOS filename - times = time values in structure (modtime should be set) - if write access to the file is available the file time is updated from the modtime field - if times is NULL the file date is set to current time - returns 0 on success or -1 on error struct utimbuf { time_t actime; - access time (not used in DOS) time_t modtime; - modification time };