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Unicode Date Pattern Formatter
Format an explicit timestamp using a supported Unicode-style date pattern in UTC.
Zoned timestamp, Unicode-style pattern
unicode-date-pattern-formatter.json (complete report)
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using the examples, or choose a local file where requested. Follow the displayed supported input shapes and limits.
- Choose Calculate result and inspect the complete result.
- Download result to save the primary file. Where supplied, additional links save source files and the full JSON report. Reset restores examples and clears output.
Examples
Zoned timestamp: 2026-10-23T01:02:03.456Z
Unicode-style pattern: yyyy-MM-dd 'at' HH:mm:ss.SSS XXX
Limitations
- Supported UTC patterns: y yy yyy yyyy; M MM MMM MMMM; d dd; H HH; h hh; m mm; s ss; S SS SSS; E EE EEE EEEE; a; X XX XXX. Quote literals with apostrophes; doubled apostrophes emit one. English Gregorian UTC and at most3 input fractional digits. Unsupported letters/widths refuse. No week-year,locale or local-time interpretation.
- Text fields are limited to100,000 UTF16 units each and400,000 combined UTF8 bytes; file fields have their own displayed limits. Combined output is at most4MiB. Processing stops after30 seconds; tool-specific bounds may be tighter.
- Generated source is a downloadable result and is not executed here. Inspection does not establish remote behavior, trust or standards certification.
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