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Git’s 2100 Date Limit: What the Parser Boundary Actually Means

A Git parser change sets a 2099 date boundary, but the evidence does not show Git as a whole will stop working in 2100. The 2038 limit on purely 32-bit systems is a separate issue.
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No—there is no evidence that Git as a whole will stop working in 2100. The specific issue is narrower: a Git date-parser change sets an upper bound of 2099-12-31T23:59:59Z for dates it parses. That is a date-parsing limit, not a documented shutdown of Git, repositories, or every Git operation. It is also separate from the Year 2038 limitation noted for purely 32-bit systems.

What Git records in a commit

A Git commit records both when the author created the work and when the committer created the commit. Git’s data-model documentation shows these as separate fields in the commit object: an author and author time, and a committer and committer time. Git’s data-model documentation

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Git documents its internal date form as a Unix timestamp—the number of seconds since the Unix epoch—plus a time-zone offset. Its date-format documentation also lists RFC 2822 and ISO 8601 forms as accepted inputs for author and committer dates.

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These details describe commit dates and their parsing. They do not establish the behavior of every timestamp or date-handling component used in a Git workflow.

What the 2099 limit applies to

A Git date-parser change dated June 25, 2024, checks for dates that exceed a stated maximum of 2099-12-31T23:59:59Z. In the cited change, this is a maximum for date parsing. It does not say that Git will cease to function in 2100, nor does it demonstrate that repositories or all other Git operations will fail then. The mirrored parser change

That distinction matters: a parser refusing a date beyond its accepted range would affect operations that need to interpret such a date. It is not equivalent to a prediction that Git itself, including operations unrelated to parsing that date, will stop working.

How this differs from the Year 2038 issue

The same parser change discusses a different constraint: purely 32-bit systems cannot express timestamps beyond 2038. This refers to the timestamp capacity of those systems, not the parser’s selected 2099 maximum. Neither date should be presented as a universal end date for Git.

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Issue Boundary stated in the source Layer described What the evidence establishes
Git date-parser maximum 2099-12-31T23:59:59Z Date parsing in the cited Git change The change sets this maximum for parsing; it does not establish a shutdown of Git as a whole.
Timestamp limit on purely 32-bit systems Beyond 2038 Timestamp expression on those systems The cited change says such systems cannot express timestamps beyond 2038; it is not the same as the 2099 parser maximum.
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What remains unknown

The cited documentation and parser change do not establish how every future Git version, downstream fork, graphical client, hosting service, CI system, filesystem, or operating system will behave after 2099. Those components have their own date handling, and their future behavior would need to be assessed separately. It would be just as unsupported to promise that all will work as it would be to claim they will all fail.

For now, the useful takeaway is specific: Git’s documented commit-date formats and the cited parser change show a parser boundary, while the 2038 note concerns timestamp capacity on purely 32-bit systems. Neither source supports the headline as a blanket forecast that Git will stop working in 2100.

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