Extract Date from UUID v1 Timestamp
UUID version 1 contains a precise creation timestamp. This tool extracts that timestamp from any v1 UUID and converts it to a readable date and time, showing both UTC and your local time zone.
UUID Timestamp to Date
Extract and convert timestamps from UUIDs
How to use
Enter your data in the input field, click Convert, and the result will appear in the output field. You can then copy or download the result.
How it works
Enter a UUID version 1 to extract and decode its embedded timestamp. UUID v1 includes a 60-bit timestamp representing 100-nanosecond intervals since October 15, 1582.
The tool parses the UUID structure, extracts the timestamp portion, converts it to a readable date and time, and shows the time in your local timezone.
Example extraction:
UUID: 6ba7b810-9dad-11d1-80b4-00c04fd430c8 Structure: Time-low: 6ba7b810 Time-mid: 9dad Time-high: 11d1 (version 1) Clock seq: 80b4 Node: 00c04fd430c8 Extracted timestamp: November 1, 1997 at 1:30:00 AM UTC
Only UUID version 1 contains timestamps. Versions 3, 4, and 5 use different generation methods and don't encode time information. The tool validates the UUID version before extraction.
When You'd Actually Use This
Database record auditing
Legacy systems use UUID v1 as primary keys. The timestamp reveals when records were created without a separate created_at column. Useful for data forensics and migration planning.
Log file analysis
Application logs include UUID v1 for request tracking. Extracting timestamps helps correlate events across services without relying on separate timestamp fields that might be out of sync.
Security incident investigation
Session tokens or transaction IDs generated as UUID v1 reveal when activities occurred. This helps build timelines during security audits or incident response.
Data migration validation
When migrating from UUID v1 to v4, extract timestamps to verify data ordering. Ensure records maintain their chronological sequence after the migration.
Debugging distributed systems
UUID v1's timestamp helps trace request flow across microservices. Compare timestamps to identify latency bottlenecks and understand event ordering.
Compliance and record retention
Regulations require knowing when records were created. UUID v1 timestamps provide creation dates for audit trails and retention policy enforcement.
What to Know Before Using
Only UUID version 1 has timestamps.Check the version digit (13th hex character). Version 1 (like xxxxxxxx-xxxx-1xxx) contains a timestamp. Version 4 (xxxxxxxx-xxxx-4xxx) is random and has no time information.
UUID v1 timestamp epoch is unusual.The timestamp counts 100-nanosecond intervals since October 15, 1582 - the start of the Gregorian calendar. This is different from Unix epoch (January 1, 1970).
Clock sequence prevents duplicates.UUID v1 includes a clock sequence that changes if the clock is set backward. This helps maintain uniqueness even with time adjustments.
Node ID may reveal MAC address.Original UUID v1 included the MAC address. Modern implementations often use random node IDs for privacy. Don't rely on node ID for machine identification.
Pro tip: UUID v1 timestamps have microsecond precision but aren't guaranteed to be monotonic. Don't use them for strict ordering without additional sequence numbers.
Common Questions
How do I identify UUID version 1?
Look at the 13th character (after the second hyphen). Version 1 UUIDs have "1" there: xxxxxxxx-xxxx-1xxx-xxxx-xxxxxxxxxxxx. Version 4 has "4", version 5 has "5".
Why does the timestamp start from 1582?
October 15, 1582 is when the Gregorian calendar began. This epoch was chosen for the DCE (Distributed Computing Environment) standard that defined UUID v1.
Can I generate UUID v1 with a specific timestamp?
Technically yes, but it's not recommended. UUID v1 generators use the current time to ensure uniqueness. Backdating UUIDs risks collisions with existing identifiers.
What's the precision of UUID v1 timestamps?
100-nanosecond intervals (10 million per second). However, most systems don't generate UUIDs this fast, so practical precision is limited by the generation rate.
Are UUID v1 timestamps timezone-aware?
The timestamp is stored in UTC. The converter displays it in your local timezone. The underlying value doesn't change based on where the UUID was generated.
Why was UUID v1 replaced by v4?
UUID v1 reveals generation time and potentially the MAC address, creating privacy concerns. UUID v4 is completely random, providing better privacy and simpler implementation.
Can I sort records by UUID v1?
Yes, UUID v1 is roughly time-ordered, but not perfectly. The timestamp bits are rearranged in the UUID string. For strict ordering, use a dedicated timestamp column.
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