Free Online DateTime Conversion Tool
Using the Time Format Converter is simple:
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Time format conversion is essential in web development and system development for scenarios such as:
RESTful APIs commonly exchange timestamps in ISO 8601 format (e.g., 2024-10-21T15:30:00Z). This tool easily converts between Unix timestamp and ISO format, or vice versa.
Convert between MySQL/PostgreSQL DATETIME format (2024-10-21 15:30:00) and ISO 8601 format used in applications. Useful for ORM and API-to-database data conversion.
Log files from different systems often have inconsistent datetime formats. This tool helps standardize formats for easier log analysis and time-series analysis.
Convert between UTC time used on servers and local timezones (JST, EST, etc.) for users. Essential for global application development.
Convert Unix timestamps (e.g., 1729491000) stored in logs or databases to human-readable format (2024-10-21 15:30:00) for efficient debugging.
RSS 2.0 requires RFC 2822 format (Mon, 21 Oct 2024 15:30:00 +0900), while ATOM feeds require RFC 3339 format. Verify correct formats for feed generation.
Convert between JavaScript Date objects and server-side datetime data. Useful for verifying toISOString() results and format compatibility.
Time formats (datetime formats) are standardized notation methods for exchanging datetime data between computer systems. They enable consistent data exchange between different programming languages, databases, and APIs.
ISO 8601 is an international standard defined by the International Organization for Standardization (ISO) for datetime notation. The format YYYY-MM-DDTHH:MM:SS±HH:MM clearly expresses year, month, day, hour, minute, second, and timezone. The 'T' separates date and time, while '±HH:MM' indicates offset from UTC.
ISO 8601: 2024-10-21T15:30:00+09:00 RFC 2822: Mon, 21 Oct 2024 15:30:00 +0900 Unix Timestamp: 1729491000 SQL Format: 2024-10-21 15:30:00
The timezone notation '+09:00' indicates Japan Standard Time (JST), which is 9 hours ahead of UTC.
Accurately exchange datetime data between different programming languages, databases, and APIs. Format standardization prevents data interpretation errors and corruption.
Proper timezone management is essential for global applications. Convert between UTC and local time to display correct times to users worldwide.
Converting Unix timestamps and machine-readable formats to human-readable formats significantly improves log file analysis and debugging efficiency.
Adhering to international standards like ISO 8601 and RFC ensures smooth integration with other systems and services, while maintaining future extensibility.
For leap second considerations or Daylight Saving Time handling, consult the documentation of your programming language or library.
RFC 3339 is a subset of ISO 8601. While ISO 8601 allows very flexible notation, RFC 3339 is more strictly defined for Internet use. In practice, using RFC 3339 format (YYYY-MM-DDTHH:MM:SSZ) is also valid ISO 8601.
With 32-bit signed integer representation, the maximum Unix timestamp is 2147483647 (January 19, 2038 03:14:07 UTC). Beyond this, overflow occurs (Year 2038 problem). The solution is to use 64-bit integers. Modern systems have largely migrated to 64-bit.
Best practice is to use UTC (Coordinated Universal Time) for databases and API communication, converting to local timezone when displaying to users. Explicitly specify timezone in ISO 8601 format (+09:00, etc.) to avoid confusion.
If using timezone libraries (JavaScript's Intl.DateTimeFormat, Python's pytz, etc.), DST is automatically considered. However, if using UTC time, DST has no effect.
Yes. ISO 8601 represents them with decimal points (2024-10-21T15:30:00.123+09:00), Unix timestamp uses 13 digits (milliseconds) or 16 digits (microseconds). JavaScript's Date.now() returns millisecond timestamp.
Unix timestamp can theoretically represent dates before 1970 (negative values), but some systems have limitations. ISO 8601 has no restrictions and can even represent BC dates (using minus sign).
JavaScript's new Date().toISOString() returns ISO 8601 format (UTC). Date.parse() can parse ISO 8601 format. Unix timestamp can be obtained with Date.now() or new Date().getTime() (in milliseconds).
Use MySQL/PostgreSQL DATETIME or TIMESTAMP types, standardizing timezone to UTC. Convert to ISO 8601 format at application layer. NoSQL databases sometimes use Unix timestamp (numeric type).
Convert between Unix timestamp and ISO 8601 format
Convert between time units: seconds, minutes, hours, days, etc.
Add, subtract dates and calculate day differences
Convert times between different locations worldwide
Convert between frames, seconds, and timecodes