UUID Timestamp Decoder
Paste any UUID and instantly decode the embedded timestamp (v1 and v7). Private, client-side, and compliant with RFC 4122.
UUID Timestamp Decoder
Powered byJavaScript & RFC 4122
All decoding happens locally in your browser. Nothing is sent to any server.
Paste a UUID and click Decode to reveal its timestamp.
Why decode UUID timestamps?
Time-based UUIDs can embed a precise timestamp. This tool helps you see the exact date/time stored inside UUID v1 and v7 values, which is useful for debugging, auditing, and tracking events.
UUID v1
Timestamp + node ID — includes a 60-bit timestamp from 1582-10-15. This tool decodes it to a human date/time.
UUID v7
Unix ms + random — contains a Unix millisecond timestamp in the first 48 bits. This tool converts it to ISO date/time.
Other versions
Versions like v4 are random and do not contain a meaningful timestamp. The tool will let you know when a UUID has no embedded time.
What is a UUID?
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label standardized by the Internet Engineering Task Force under RFC 4122.
UUIDs are designed to be unique across all time and space without requiring a central registration authority. Two independently generated UUIDs can be assumed to be distinct, thanks to their extreme statistical uniqueness.
- 128 bits = 16 bytes of data
- Represented as 32 hex digits + 4 dashes (36 chars)
- Case-insensitive — upper or lowercase are equivalent
- Supported natively in PostgreSQL, MySQL, MongoDB, and more
UUID Format
32 bits
16 bits
16 bits
16 bits
48 bits
The 13th character encodes the version (e.g. 4 for v4).
The 17th character (after 3rd dash) encodes the variant.
UUID Versions Compared
There are several UUID versions, each suited to different use cases.
| Version | Generation Method | Best For | Requires |
|---|---|---|---|
| v1 | MAC address + timestamp | Time-ordered logging — UUID v1 Generator → | Network interface |
| v2 | DCE Security (POSIX UID/GID) | Legacy DCE systems | System identity |
| v3 | MD5 hash of namespace+name | Deterministic IDs from names — UUID v3 Generator → | Namespace UUID + input |
| v4 | Cryptographically random | General purpose — most common — UUID v4 Generator → | Nothing (random) |
| v5 | SHA-1 hash of namespace+name | Deterministic IDs (secure) | Namespace UUID + input |
| v6 | Reordered timestamp (RFC 9562) | Sortable time-based IDs | Clock + node |
| v7 | Unix timestamp + random (RFC 9562) | Database-friendly sortable IDs | Nothing (modern standard) |
Example UUIDs
Click an example to decode its timestamp (when available).
How This UUID Timestamp Decoder Works
This tool validates the UUID format and detects its version and variant. For UUID v1 and v7, it decodes the embedded timestamp to a human-readable ISO date/time.
Everything runs locally in your browser—the UUID never leaves your device.
Common Use Cases
This tool is useful when you need to:
Frequently Asked Questions
Concise answers about UUID timestamps and this decoder tool.
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