Modular•2mo ago

How to get unix timestamp?

Hi, is there currently currently any API to get the unix timestamp (since unix epoch)? I read the docs for time.now() and it seems it only measures the time from the system boot.

13 Replies

Gerald Scharitzer•2mo ago

The standard library does not seem to provide that yet. An alternative is to call Python https://docs.python.org/3/library/time.html#time.time_ns from Mojo.

Python documentation

time — Time access and conversions

This module provides various time-related functions. For related functionality, see also the datetime and calendar modules. Although this module is always available, not all functions are available...

sazidOP•2mo ago

thanks I'm utilizing this for now

Darkmatter•2mo ago

time._realtime_nanoseconds returns the timestamp in nanoseconds, but it is subject to adjustment. If you are fine being Linux only, time._gettime_as_nsec_unix(11) is not subject to daylight savings.

sazidOP•2mo ago

linux only will be okay too as long as it's possible to provide a fallback mechanism for other OSes via a compile-time parameter check... https://docs.modular.com/mojo/stdlib/sys/info/os_is_linux https://docs.modular.com/mojo/stdlib/sys/info/os_is_macos https://docs.modular.com/mojo/stdlib/sys/info/os_is_windows thanks for this, let me try it out this seems to be working for macos as well... m1 arm64

Darkmatter•2mo ago

Double check the man pages 11 is CLOCK_TAI on Linux.

sazidOP•2mo ago

sorry, I used the time._realtime_nanoseconds you're correct, the _gettime_as_nsec_unix(11) does not work in mac I suppose, anything that starts with an underscore should be considered more experimental than other items?

Darkmatter•2mo ago

It technically means private But the alternative is writing it all yourself Mojo doesn't have a way to enforce API boundaries yet.

sazidOP•2mo ago

fn time_ms() raises -> Int64:
    @parameter
    if os_is_linux():
        time_ns = Int64(time._gettime_as_nsec_unix(11))
    else:
        var time = Python.import_module("time")
        time_ns = Int64(time.time_ns())

    var time_ms = time_ns // 1_000_000
    return time_ms

fn time_ms() raises -> Int64:
    @parameter
    if os_is_linux():
        time_ns = Int64(time._gettime_as_nsec_unix(11))
    else:
        var time = Python.import_module("time")
        time_ns = Int64(time.time_ns())

    var time_ms = time_ns // 1_000_000
    return time_ms

This is what I ended up with for the time being.

a2svior•2mo ago

@sazid also check out https://github.com/thatstoasty/small-time a fork of https://github.com/mojoto/morrow.mojo , those are both libraries for better time/date ergonomics on Mojo

GitHub

GitHub - thatstoasty/small-time: Datetime library forked from morro...

Datetime library forked from morrow.mojo for my projects - thatstoasty/small-time

GitHub

GitHub - mojoto/morrow.mojo: Human-friendly date & time for Mojo 🔥

Human-friendly date & time for Mojo 🔥. Contribute to mojoto/morrow.mojo development by creating an account on GitHub.

sazidOP•2mo ago

looks great! it looks like morrow internally calls into libc - does that mean the binaries built with this will be dynamic unless we compile against musl? what's the difference between the two? more ergonomic calling into libc and the magic based project?

a2svior•2mo ago

Currently Morrow is not up-to-date with the latest Mojo version and small_time also has a nightly branch that's up-to-date with currently nightly. Also I think @toasty made small_time a bit smaller than Morrow in terms of functionality can't say for sure about binaries, maybe other folks know more

sazidOP•2mo ago

i see, thanks

toasty•2mo ago

Functionally, they’re very much the same. I did a bit of reorganization and cleanup of the code, but they both use libc calls in the same way. There’s also a datetime module in the forge-tools repo that @Martin Vuyk put a lot of time into!

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How to get unix timestamp?