Hijri-Gregorian Converter

About This Tool

This tool provides bidirectional date conversion between Gregorian and Hijri calendars. It is designed for researchers, educators, planners, and Muslims who need precise cross-calendar scheduling. By taking a source date in one calendar and returning the equivalent date in the other, it eliminates manual lookup and reduces errors in planning events, research timelines, or historical analysis. The system accepts standard ISO 8601 inputs and can be used for single-date checks or batch-like queries via API in development contexts. Default behavior assumes Gregorian to Hijri unless the user explicitly selects the reverse direction.

Core algorithmic approach and outputs: The conversion is performed by translating the source date to an absolute day count, then mapping that day to the target calendar. Outputs include the target calendar date in YYYY-MM-DD format and the day of the week, when applicable. The tool validates inputs, enforces supported ranges, and reports precise errors if a date lies outside the supported window. For time components, the tool can preserve or ignore the time portion as needed.

Use cases and differentiators: Academic researchers comparing events across calendars, religious communities coordinating holidays, and travel planners benefit from deterministic results and transparent assumptions. The tool aligns with ISO formatting, supports locale-aware rendering in en-US contexts, and relies on widely accepted conversion algorithms. It does not perform time-zone conversions and does not support other lunar calendars. Its value lies in accuracy, speed, and clear handling of edge cases such as lunar month variability and leap-year effects in the Gregorian calendar.

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