ISO 8601 & RFC 3339 Date Formatter
Convert and format timestamps into ISO 8601, RFC 3339, RFC 2822, and standard formats.
ISO 8601 & RFC 3339 Date Formatter
Convert and format timestamps into ISO 8601, RFC 3339, RFC 2822, and standard formats
How to Use ISO 8601 & RFC 3339 Date Formatter
1. Select Reference Date or Time
Pick your calendar dates, enter timestamps, or set your target countdown duration.
2. Instant Chronological Calculation
Calculates time differences, timezone conversions, or formatted dates using standard time protocols.
3. Copy Formatted Result
Copy the standardized date string, duration breakdown, or scheduled event with one click.
How This Utility Works
Fast timestamp and date string conversion tool. Formats any date into ISO 8601 UTC Zulu, RFC 3339, RFC 2822 HTTP headers, Unix epoch timestamps (seconds and milliseconds), and short human calendar dates.
Timezone projections and Unix epoch calculations run against your local device clock and internationalization tables without network polling.
Frequently Asked Questions
What format is ISO 8601?
The international standard YYYY-MM-DDTHH:MM:SS.sssZ format used across APIs and databases worldwide.
Standardized Date & Time Formats
| Standard | Format Example | Description | Application |
|---|---|---|---|
| ISO 8601 | 2026-10-14T21:45:00Z | Universal UTC timestamp with Z indicator | REST APIs, JSON payloads, MongoDB |
| Unix Epoch (Sec) | 1791995100 | Seconds elapsed since 1970-01-01 | Database timestamps, JWT expiry (exp) |
| Unix Epoch (Ms) | 1791995100000 | Milliseconds elapsed since 1970-01-01 | JavaScript Date.now(), browser performance |
| RFC 2822 | Wed, 14 Oct 2026 21:45:00 GMT | Email and HTTP header date format | HTTP Last-Modified, SMTP headers |
| SQL Date | 2026-10-14 | Standard relational date column | PostgreSQL, MySQL, SQLite date fields |