I am running a Foolcraft server and the mob masher currently doesn't inflict any damage to any mobs. It seems to work fine offline but I can't seem to figure out what is causing it to not function on the server.

I've download the last version of the mod for minecraft 1.18.2 and offline it works, when I go to the server it doesn't work, can you help me to solve this problem

Hello,
I'm not sure. There is the same issue with the 'Levels' mod that levels up tools.
The mob masher uses a Fake Player with an actual sword where I add and remove the upgrades - I would suggest that another mod that may effect weapons or tools may be causing the issue.
Sorry I can't be of much help with this - but it's a place to start if you need to de-bug the mod interactions.
Cheers,
Me.

Hello,
I think I have solved the issue - it's a derp on my behalf.
I'm using the wrong world time checking (other devs reminded me about this and I forgot to fix it) - whoops. I'll see about getting an update out and fixing this for future versions but it's not a game breaking issue for now. Thanks for the report - I'll leave this open until it's fixed just as a reminder :)
Cheers,
Me.

bug still affects 1.10 i have created a Pull Request to fix it.