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  • For example in 31.0.1889.174

    31 is the major version number, but what are the other three numbers? I seem to remember there was a blog post explaining this, but I am having trouble finding it.

  • Found it. OPR/[version major].[version minor].[build].[patch] (edition) ref

  • For Developer, "build" will actually be the date it was built on - as in, build number is auto-incremented daily. Not knowing the exact date they are using for build 1 though it isn't a direct conversion. When Developer shifts to Beta and then Stable, they stop incrementing "build" at the branch point and only patch level goes up - but patch level isn't once daily, it is whenever they make a change to it. So even on Developer I've seen patch levels of like 24 (that is, in one day).