`os.epoch()` results are not in milliseconds

[ouroborus]

Minecraft Version

1.18.x

Version

1.100.8

Details

The CC:Tweaked docs say that "ingame" is the default argument and that it produces the number of milliseconds since world creation. However, os.epoch() gives values that appear to be in 1/72nds of a millisecond.

Examples:

lua> a=os.epoch(); os.sleep(0.05); b=os.epoch(); c=b-a; print(c)
3600

0.05 seconds is 50ms or one tick, so the results in the example should be near 50.

lua> a=os.epoch("utc"); os.sleep(0.05); b=os.epoch("utc"); c=b-a; print(c)
38

Typical of actual game tick timing, but close to 50ms.

[Merith-TK]

can this be reproduced on 1.19 as well? it wont matter either way but if it is reproducible on 1.19 then it would be useful to know. (same with #123 )

[ouroborus]

Verified with 1.101.2 in 1.19.2

[toad-dev]

This is actually the intended behavior. The "ingame" epoch is in-game time. There are 72 Minecraft days in one real-world day, so there are 72 Minecraft milliseconds in one real-world millisecond! Also, note that the "ingame" epoch freezes if you disable the world's daylight cycle. The "utc" and "local" options are available if you want wall clock time.

[Merith-TK]

What I think they meant was that epoch is not returning it in the same way CC;T does

On Sun, Sep 4, 2022, 6:28 PM toad-dev @.***> wrote:

Closed #124 https://github.com/cc-tweaked/cc-restitched/issues/124 as completed.

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[toad-dev]

With the provided example CC: Tweaked produces the same result.

[ouroborus]

Yeah, even the original ComputerCraft produces these results. Alright, then I'd say this is a documentation issue. CC:Tweaked just says it returns the results in milliseconds with no indication that these aren't real world milliseconds.