from Pogo, Walt Kelly

The turtle has been swimming in the kernel.

1. Manual Pages

2. Table of Contents

3. Synopsis

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

4. Description

Checks the kernel configuration for the NTP user interface syscalls ntp_gettime() and ntp_adjtime(). If present, the current timekeeping data are displayed. If not, a disappointment is displayed. See the kernel page file in the HTML documentation in distribution for further details.

A similar display can be obtained using the ntpq program and kerninfo command.

This program is useful only with kernels featuring the ntp_adjtime(2) system call or local equivalent, as described in the A Kernel Model for Precision Timekeeping page,

5. Options


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.


Report in JSON rather than plain text.

-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.


Print the version string and exit.

6. Bugs

The format for modes and status in the JSON report is less than ideal.

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