Paste a UUID to validate its format and detect its version (v1βv8) and variant. Time-based UUIDs (v1, v6, v7) have their embedded timestamp decoded into Unix time and a human-readable date.
A UUID (Universally Unique Identifier) is a 36-character, 8-4-4-4-12 hexadecimal string. The first digit of the third group is the version (v1 time+MAC, v4 random, v6 reordered time, v7 Unix-time based); the top bits of the first digit of the fourth group are the variant (usually RFC 4122/9562, values 8βb). This tool detects both automatically.
v1 and v6 carry a 60-bit Gregorian timestamp counted in 100-nanosecond intervals since 1582-10-15, so converting to Unix time means subtracting the epoch offset and dividing by 10,000. v7 puts a plain Unix-millisecond timestamp in its first 48 bits, which makes it naturally sortable. This tool extracts the timestamp per each version's rules and shows ISO 8601 plus local time.
v4 is fully random, so it has no sort locality in database indexes and can hurt performance. v7 is time-sortable while staying random, making it a great primary key; v6 rearranges the classic v1 fields so they sort chronologically. Use v4 when you need no time data, and v7 when you want sortable identifiers.