Tech article

UUIDv7 doesn't have the properties you think it does

Hacker News | Oct 23, 2026 | ibobev

Automated excerpt

Certain RFC compliant implementations of UUIDv7 violate these properties to extreme degrees. Implementations MAY alter the actual timestamp. — RFC 9562 §6.1 This specification makes no requirement or guarantee about how close the clock value needs to be to the actual time. — RFC 9562 §6.1 … implementations MAY increment the timestamp ahead of the actual time … — RFC 9562 §6.2 Incrementing the timestamp ahead of the system clock is an interesting problem. One prominent implementation that increments the timestamp is the Python standard library’s UUIDv7.

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