Delta is the number of seconds since the last frame. So to get the number of milliseconds, you can just do delta*1000
this post was submitted on 02 Oct 2023
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That's what delta is for. It calculates the amount of time that has passed since the last frame (tick) in milliseconds.
You mainly use it for lag compensation or interpolation but you can use it for anything. It's basically a fractional frame.
EDIT: You can also use it as a lagometer. If the ms goes higher than the tick rate, that's how you know that your game is under load.
Thanks! This is a big help!