A cross-calendar month grid and year strip for Gregorian dates, Chinese day labels, Hebrew dates, Islamic dates and browser-visible source boundaries.
Use the instrument above, then check the calculation record, assumptions and related tools below.
Visualizer
Saturday 05 September 2026 maps to 24 Seventh Month, 23 Elul 5786, and 23 Rabiʻ I 1448.
Calendar names and day numbers rely on ECMAScript Intl calendar support. This is a browser-local visualizer, not an official religious or civil calendar authority.
Method
Each visible day starts as a local Gregorian Date object at noon. The page formats that date through ECMAScript Intl calendars for Chinese, Hebrew and Islamic Umm al-Qura labels where supported, then samples each Gregorian month for the year-strip view.
Gregorian date to Intl.DateTimeFormat with calendar option to calendar-specific year, month and day parts.
Browser calendar data can vary by implementation. Use official calendar authorities for religious observance, law or publication-critical dates.
Built from Billy's downloaded `multi_calendar_visualizer.html` and `calendar-cross-reference.html` ideas, then adapted into the CalculationTime hero/page system.