Changelog

Added

• Full calendar metadata support for 2001–2089 BS including Tithi (lunar day), public holiday flag, and event descriptions in both Nepali and English, exposed through NepaliDate.Calendar returning a CalendarInfo struct.
• NepaliDateRange type with intersection, union, except, split-by-month, split-by-fiscal-quarter, working-day and weekend iteration, and interval-based enumeration.
• FiscalYear static helpers plus instance methods on NepaliDate for Nepal fiscal year (Shrawan–Ashadh) start, end, quarter detection, and boundary queries.
• SmartDateParser with support for 100+ month-name spellings (English, Nepali Devanagari, and transliterations), alternate separators, short-year input, and Nepali Unicode digits.
• BulkConvert.ToNepaliDates and BulkConvert.ToEnglishDates with automatic parallelization for datasets over 500 items and explicit batchSize control.
• Native IParsable<NepaliDate>, ISpanParsable<NepaliDate>, and ISpanFormattable implementations on the net8.0 target.
• System.Text.Json and Newtonsoft.Json converters with string-mode and object-mode options.
• XmlSerializer support via the NepaliDateXmlSerializer wrapper.
• TypeConverter registration for ASP.NET model binding, WPF, and WinForms property grids.
• NepaliMonths, DateFormats, Separators, and FiscalYearQuarters enums.
• Custom format strings via FormatCustom with token support (yyyy, yy, MMMM, MMM, MM, M, dd, d) plus literal quoting and escape sequences.

Improved

• BS → AD conversion path rewritten to use flat-array lookups. Now runs at 4.5 ns/op with zero allocations.
• AD → BS conversion optimized to be over 8,600× faster than the previous version and every competing library.
• Parsing performance improved across all input formats, including Unicode digit handling.
• Internalized Newtonsoft.Json and System.Text.Json dependencies using PrivateAssets=all, so consumers get a zero-dependency NuGet install.
• Memory layout of NepaliDate tightened; the type now packs into 4 bytes and is fully stack-allocated.
• Documentation website launched at rajuprasai.github.io/NepDate with full API reference, searchable docs, and runnable examples.

Fixed

• autoAdjust on NepaliDate constructor and TryParse now correctly swaps month and day when month is in range 13–31 and day is 1–12, matching the documented behavior. Previously inputs like "2080/13/12" threw instead of yielding 2080/12/13.
• Conversion accuracy at the upper end of the supported year range. Future dates near 2199 BS now resolve correctly.
• 2082/03 and 2082/04 day-count drift corrected (issue #18).
• English DateTime round-trip preserves DateTimeKind where applicable.
• Corrected boundary handling at the start and end of the supported year range (1901 BS and 2199 BS).
• Leap-day handling in AddMonths and AddYears now clamps correctly when the target month has fewer days than the source.
• TryParse no longer throws on empty strings or whitespace; it returns false as documented.

Maintenance

• Repository moved to github.com/rajuprasai/NepDate. Old links continue to redirect.
• Package metadata refreshed (author, project URL, copyright through 2026).
• Test suite expanded to 542 unit tests covering construction, parsing, formatting, conversion, fiscal year, ranges, calendar metadata, and serialization.