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Calendar Period Progress Calculator
Calculate six calendar-period progress fractions from an explicit fixed-offset instant.
Explicit date and time, Fixed UTC offset in minutes
calendar-progress.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Enter a date, a time with optional millisecond precision and a fixed UTC offset.
- Calculate the six half-open calendar periods containing that explicit instant.
- Download the complete boundary, fraction and percentage report.
Examples
At 12:00:00 in an ordinary fixed-offset day, that day's elapsed fraction is 1/2.
Limitations
- Input years 0002 through 9998, millisecond precision and fixed offsets from -840 through 840 minutes. Every reported boundary must stay inside years 0001 through 9999. At most 4096 combined input units, 64 KiB output and 30 seconds.
- Periods are half open and weeks start on Monday. Percentages use six-decimal half-away-from-zero rounding.
- No host clock, IANA timezone, daylight-saving transition or leap-second calculation.
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