Monotonic wall-clock time for OCaml
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Mtime — Monotonic wall-clock time for OCaml


Mtime has platform independent support for monotonic wall-clock time in pure OCaml. This time increases monotonically and is not subject to operating system calendar time adjustments. The library has types to represent nanosecond precision timestamps and time spans.

The additional Mtime_clock library provide access to a system monotonic clock.

Mtime has a no dependency. Mtime_clock depends on your system library. The optional JavaScript support depends on js_of_ocaml. Mtime and its libraries are distributed under the ISC license.

Home page:
Contact: Daniel Bünzli <daniel.buenzl>


Mtime can be installed with opam:

opam install mtime
opam install js_of_ocaml mtime  # mtime with jsoo support

If you don't use opam consult the opam file for build instructions.


The documentation and API reference is automatically generated from the source interfaces. It can be consulted online or via odig doc mtime.

Sample programs

If you installed mtime with opam sample programs are located in the directory opam config var mtime:doc.

In the distribution sample programs and tests are located in the test* directories. They can be built and run with:

topkg build --tests true && topkg test