Convert a Gregorian date to its equivalent in the Hijri (Islamic) and Bengali calendars — useful for invitations, anniversaries and religious dates.
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Different calendars start their year at different points and count their months differently. The Gregorian calendar (used internationally) starts in January and has 12 months totaling 365 or 366 days. The Hijri (Islamic) calendar is lunar — 12 months of 29 or 30 days totaling 354 days, so it drifts about 11 days earlier each Gregorian year. The Bengali calendar follows a solar-tropical structure with 12 months and starts on April 14 (Pohela Boishakh) in modern Bangladesh.
The calculator maps a chosen Gregorian date to its equivalents in both systems. The Hijri conversion uses the Umm al-Qura (Saudi civil) calendar, which is the most widely cited Islamic civil calendar. Bengali calendar rules in this calculator follow the modernised Bangladesh convention.
These are approximations for calendars where exact-day correspondence depends on local moon-sighting (Hijri) or specific reform standards (Bengali). For religiously significant dates, always confirm with a local authority — the calculator is a good first reference, not a final source.
Because the Islamic calendar traditionally depends on actual moon sighting, which varies by location. The Umm al-Qura calendar (used here) is a pre-calculated civil version that sometimes differs from local observation by one day.
Not always. Bangladesh adopted a modern reform that fixes the start date to April 14 and standardises month lengths. India uses several regional versions with slightly different rules.
Currently the tool converts from Gregorian to the other two. For Hijri-to-Gregorian or Bengali-to-Gregorian, use a regional calendar service or contact us to suggest the feature.
The Date Convert to Major Calendars lives alongside Age Calculator, Date Count Calculator, Online Calendar Tool on the Productivity page. That landing page collects every productivity tool Dailiyo publishes, plus the editorial notes on formula sources, review cadence and how each result should (and should not) be interpreted. If a related productivity calculation isn't yet in the collection and you'd like to see it, drop a line via the contact page — the editorial team reviews every request and prioritises tools that come up most often in reader questions.