Crate bongabdo 

Convert Gregorian dates into Bengali calendar dates across multiple standards.

Supported Standards

This crate currently models three Bengali calendar variants:

• CalendarStandard::Bangladesh Current official Bangladesh civil calendar after the 2019 revision.
• CalendarStandard::BangladeshLegacy Earlier fixed Bangladesh civil calendar adopted in 1987.
• CalendarStandard::WestBengalTraditional Traditional solar calendar used in West Bengal and commonly used for Bengali dates in India.

When parsing CalendarStandard from text, the short aliases BD, BD_LEGACY, WB, and IN are supported.

Choosing A Standard

Use CalendarStandard::Bangladesh when you want the current official Bangladesh civil calendar where Pohela Boishakh is fixed on April 14 and the first six months have 31 days.

Use CalendarStandard::BangladeshLegacy when you need compatibility with the older revised Bangladesh civil calendar where the first five months have 31 days.

Use CalendarStandard::WestBengalTraditional when you want the traditional solar calendar used in West Bengal or India-focused Bengali date contexts. This path is modeled from sidereal solar ingress rather than a fixed civil offset, so it should not be treated as “Bangladesh plus or minus one day.”

Examples

use bongabdo::{Bongabdo, CalendarStandard};

let bangladesh = Bongabdo::from_ymd(2026, 4, 14, CalendarStandard::Bangladesh)?;
assert_eq!((bangladesh.year, bangladesh.month, bangladesh.day), (1433, 1, 1));

let west_bengal =
    Bongabdo::from_ymd(2026, 4, 15, CalendarStandard::WestBengalTraditional)?;
assert_eq!((west_bengal.year, west_bengal.month, west_bengal.day), (1433, 1, 1));

Structs

Bongabdo

Represents a date in the Bengali calendar.

ParseCalendarStandardError

Error returned when parsing a calendar standard string.

Enums

BongabdoError

Errors returned by Gregorian to Bengali conversion APIs.

CalendarStandard

Selects which Bengali calendar standard should be used for conversion.