Date Format Converter
The Date Format Converter is a professional timestamp and date format conversion tool supporting one-click conversion between 10 common date-time formats. Suitable for development debugging, data migration, API integration, and other technical scenarios requiring different date format handling.
Key Features
Multi-Format Support
The tool supports mutual conversion between the following 10 date-time formats:
Standard Formats
- Locale Format: Browser local timezone format, e.g.,
Thu Dec 19 2024 10:30:45 GMT+0800 - ISO 8601: International standard format
2024-12-19T10:30:45.123Z - ISO 9075: SQL-friendly format
2024-12-19 10:30:45.123 - RFC 3339: Internet standard format
2024-12-19T10:30:45+08:00 - RFC 7231: HTTP date format
Thu, 19 Dec 2024 10:30:45 GMT
Timestamp Formats
- Unix Timestamp (seconds): 10-digit number, e.g.,
1703038245 - JavaScript Timestamp (milliseconds): 13-digit number, e.g.,
1703038245123
Special Formats
- UTC: Coordinated Universal Time format
Thu, 19 Dec 2024 02:30:45 GMT - MongoDB ObjectId: 24-character hexadecimal, first 8 characters are timestamp
- Excel Serial Number: Floating-point number representing days since 1900-01-01
Each format has clear usage scenarios and technical standards.
Intelligent Input Recognition
Supports multiple input formats with automatic recognition and parsing:
- Standard date strings (e.g.,
2024-12-19,12/19/2024) - Timestamps (10 or 13-digit numbers)
- ISO format strings
- Natural language descriptions (e.g.,
today,yesterday, requires browser support)
Input is validated in real-time for format validity; invalid input clears conversion results.
Millisecond Precision
All conversions maintain millisecond-level time precision, suitable for high-precision time requirements such as log analysis, performance monitoring, and trading systems.
One-Click Copy
Each format provides an independent copy button; click to copy to clipboard for convenient use in code. Supports batch copying of multiple formats.
Real-Time Conversion
All format conversion results update in real-time when input field value changes, without clicking buttons. Results can be viewed during editing, improving operational efficiency.
Use Cases
Backend Development
Handle date format differences across databases and APIs:
- MySQL uses ISO 9075 format
- PostgreSQL supports ISO 8601 format
- MongoDB uses ObjectId or ISODate
- Redis commonly uses Unix timestamps
- HTTP APIs use RFC 7231 or ISO 8601
Tool helps quickly convert formats, ensuring data compatibility.
Frontend Development
JavaScript native Date object, Moment.js, dayjs, and other libraries handle dates differently; tool provides standard reference to avoid timezone and format issues.
Data Analysis
Log files, CSV data, and database exports often contain timestamps in different formats; use tool to uniformly convert to readable format for analysis and visualization.
API Integration
When integrating third-party APIs, convert date formats according to documentation requirements. For example, some APIs require RFC 3339 format, others require Unix timestamps; tool provides quick reference and validation.
Debugging and Testing
Construct test cases with specific times for unit tests and integration tests; use tool to quickly generate test data in various formats.
Format Descriptions
ISO 8601
International standard date-time format, widely used for data exchange. Features:
- Format:
YYYY-MM-DDTHH:mm:ss.sssZ - T separates date and time
- Z indicates UTC timezone (or use +08:00 for timezone offset)
- Accurate to milliseconds
Suitable for JSON APIs, database storage, internationalized applications.
Unix Timestamp
Seconds (10 digits) or milliseconds (13 digits) elapsed since 1970-01-01 00:00:00 UTC. Features:
- Pure numbers, easy to store and calculate
- No timezone concept, always UTC
- Suitable for sorting and comparison
Suitable for system logs, cache expiration times, token validity periods.
RFC 7231
HTTP protocol standard date format, used in HTTP headers (such as Last-Modified, Expires). Features:
- Format:
Day, DD Mon YYYY HH:mm:ss GMT - Always uses GMT (equivalent to UTC)
- English weekday and month abbreviations
Suitable for HTTP cache control, cookie expiration times.
MongoDB ObjectId
Default primary key format for MongoDB documents, 12 bytes (24-character hexadecimal) encoding, containing:
- First 4 bytes (8-character hexadecimal): Unix timestamp (seconds)
- Middle 5 bytes: Machine identifier and process ID
- Last 3 bytes: Incrementing counter
This tool only converts timestamp portion; generated ObjectId's last 16 characters are placeholder 0000000000000000.
Excel Serial Number
Internal storage format for Excel dates, floating-point number representing days since 1900-01-01. Features:
- Integer part: Days
- Decimal part: Time (0.5 represents 12:00)
- 1900-01-01 is serial number 1
Suitable for Excel data import/export, financial report processing.
Important Notes
Timezone Handling
Different formats handle timezones differently:
- ISO 8601, RFC 3339: Clearly mark timezone offset
- Unix timestamp, UTC: Always UTC time
- Locale format, ISO 9075: Based on browser local timezone
Pay attention to timezone differences during conversion to avoid time deviations due to timezone issues.
Precision Loss
Some formats have lower precision:
- Unix timestamp (seconds): No millisecond information
- MongoDB ObjectId: Only preserves second-level timestamp
- Excel serial number: Precision affected by floating-point arithmetic
Scenarios requiring millisecond precision should use ISO 8601 or JavaScript timestamp.
Historical Dates
Negative Unix timestamps represent dates before 1970; some systems do not support them. Excel serial number's 1900-02-29 is an erroneous date (1900 was not a leap year); note compatibility.
Browser Compatibility
Date parsing depends on browser Date object implementation; different browsers may have differences in support for certain formats. Use standard formats (like ISO 8601) to ensure compatibility.
Comparison with Similar Tools
Compared to tools like epochconverter.com and unixtimestamp.com, this tool's advantages:
- Supports 10 formats covering common development scenarios
- Real-time conversion with immediate display
- Independent copy buttons for convenient operation
- Chinese localized interface lowering usage threshold
- Millisecond-level precision meeting high-precision needs
- Pure frontend implementation ensuring privacy and security
Suitable for developers and data analysts who frequently need date format conversion.
