# uuid/v7 Generate a time-ordered version-7 UUID (RFC 9562 §5.7). The first 48 bits are the unix-epoch millisecond timestamp; the remaining 74 bits are random from the OS CSPRNG. ## Syntax

[uuid/v7]

## Examples

[uuid/v7]    # "01a062db-235b-708a-b7e8-0689af43cf6c"

# Lexicographic sort == insertion order:
set a [uuid/v7]
set b [uuid/v7]
($a < $b)    # true when b was created later (same-ms draws aside)

## Returns Lowercase canonical UUID string in 8-4-4-4-12 form, version nibble `7`. ## Notes Because the timestamp leads the string, v7 UUIDs sort lexically by creation time — prefer them for database primary keys, event ids, and log correlation ids where index locality matters. UUIDs generated within the same millisecond are ordered by their random bits. ## See Also `uuid/v4`, `uuid/nil`, `uuid/valid?`