| -c | Display the execution time of ntptime itself. |
| -e est_error |
| | Specify estimated error, in microseconds. |
| -f frequency |
| | Specify frequency offset, in parts per million. |
| -h | Display help information. |
| -l | Specify the leap bits as a code from 0 to 3. |
| -m max_error |
| | Specify max possible errors, in microseconds. |
| -o offset |
| | Specify clock offset, in microseconds. |
| -r | Display Unix and NTP times in raw format. |
-s status
-t time_constant |
| | Specify time constant, an integer in the range 0-4. |
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