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Home/ Questions/Q 410773
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T17:55:17+00:00 2026-05-12T17:55:17+00:00

struct timeval represents and instant in time with two members, tv_sec (seconds) and tv_usec

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struct timeval represents and instant in time with two members, tv_sec (seconds) and tv_usec (microseconds). In this representation, tv_usec is not by itself an absolute time it is a sub second offset off of tv_sec.

struct timespec works the same way except that instead of microseconds it’s offset (tv_nsec) is stored in nanosecond units.

The question is: Is there a standard way to convert between these two?

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  1. Editorial Team
    Editorial Team
    2026-05-12T17:55:17+00:00Added an answer on May 12, 2026 at 5:55 pm

    Looking at this doc, I would think multiplying tv_usec by 1000 is sufficient to get tv_nsec.

    More important, I suspect is the source of the different structures: they could be filled by different clocks.

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