file_time_type last_write_time(const path& p); file_time_type last_write_time(const path& p, error_code& ec) noexcept;
Returns: The time of last data modification of p, determined as if by the value of the POSIX stat structure member st_mtime obtained as if by POSIX stat(). The signature with argument ec returns file_time_type::min() if an error occurs.
void last_write_time(const path& p, file_time_type new_time); void last_write_time(const path& p, file_time_type new_time, error_code& ec) noexcept;
Effects: Sets the time of last data modification of the file resolved to by p to new_time, as if by POSIX futimens().
[ Note: A postcondition of last_write_time(p) == new_time is not specified since it might not hold for file systems with coarse time granularity. — end note ]
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