ntptime - read and set kernel time variables

Last update: November 23, 2022 17:49 UTC (1b4d24aef)


from Pogo, Walt Kelly

The turtle has been swimming in the kernel.

Table of Contents


ntptime [ -chr ] [ -e est_error ] [ -f frequency ] [ -m max_error ] [ -o offset ] [ -s status ] [ -t time_constant]


This program is useful only with special kernels described in the A Kernel Model for Precision Timekeeping page. It reads and displays time-related kernel variables using the ntp_gettime() system call. A similar display can be obtained using the ntpdc program and kerninfo command.



Display the execution time of ntptime itself.

-e est_error

Specify estimated error, in microseconds.

-f frequency

Specify frequency offset, in parts per million.


Display help information.

-m max_error

Specify max possible errors, in microseconds.

-o offset

Specify clock offset, in microseconds.


Display Unix and NTP times in raw format.

-s status

Specify clock status. Better know what you are doing.

-t time_constant

Specify time constant, an integer in the range 0-10.