NepDate - Fast & Efficient Nepali Date Library for .NET

Modern, High-Performance Bikram Sambat Date Operations for .NET Applications

NepDate is a super-fast and memory-efficient struct built on .NET Standard 2.0 that offers comprehensive Nepali date functionality in a lightweight package. Designed to closely resemble the DateOnly struct in .NET, NepDate provides a familiar, intuitive API for working with Nepali dates (Bikram Sambat).

📋 Table of Contents

Section	Description
📦 Installation	How to add NepDate to your project
✨ Key Features	What makes NepDate special
🚀 Getting Started	Begin using NepDate quickly
📅 Date Operations	Core date manipulation functions
🔄 Date Range Operations	Operations related to date ranges
🖨️ Formatting & Display	Control how dates appear
💼 Fiscal Year Operations	Business date calculations
🔍 Advanced Features	For power users
⚡ Performance	Why NepDate is faster
👥 Contributions	How to help improve NepDate
📝 Change Log	Recent updates

📦 Installation

Using Package Manager Console

Install-Package NepDate

Using .NET CLI

dotnet add package NepDate

✨ Key Features

🔄 Date Conversion: Seamlessly convert between Bikram Sambat (B.S.) and Gregorian (A.D.) dates
✅ Robust Validation: Full support for Nepali date validation with correct day limits for each month
🧮 Date Arithmetic: Add or subtract days, months, and years with precision
🔍 Smart Parsing: Intelligent date parsing with support for multiple formats and dialects
🖋️ Date Formatting: Localized date formatting with multiple Nepali dialects and formal/informal styles
📊 Fiscal Year Support: Built-in functions for fiscal year calculations and quarter periods
💾 Serialization Support: Complete integration with System.Text.Json, Newtonsoft.Json, and XML
⚡ Performance: Benchmarked to be significantly faster than other Nepali date libraries
📦 Memory Efficient: Implemented as a struct to minimize memory footprint

🚀 Getting Started

Initialize NepaliDate

From Nepali year, month, and day values

using NepDate;

var nepDate = new NepaliDate(2079, 12, 16);

From a string

using NepDate;

var nepDate = new NepaliDate("2079/12/16");
// or
var nepDate = NepaliDate.Parse("2079/12/16");

From English DateTime

using NepDate;
using NepDate.Extensions;

var nepDate = new NepaliDate(DateTime.Now);
// or
var nepDate = DateTime.Now.ToNepaliDate();

Get current Nepali date

using NepDate;

var today = NepaliDate.Now; // Initializes with current Nepali date

Accessing Properties

using NepDate;

var nepDate = new NepaliDate("2079/12/16");

// Basic properties
int year = nepDate.Year;        // 2079
int month = nepDate.Month;      // 12
int day = nepDate.Day;          // 16
DateTime engDate = nepDate.EnglishDate;  // 2023/03/30
DayOfWeek weekDay = nepDate.DayOfWeek;   // Thursday
int dayOfYear = nepDate.DayOfYear;       // 245

// Month details
int lastDay = nepDate.MonthEndDay;       // 30
NepaliDate monthEnd = nepDate.MonthEndDate();  // 2079/12/30
NepaliMonths monthName = nepDate.MonthName;  // Chaitra

📅 Date Operations

Adding and Subtracting Time

using NepDate;

var nepDate = new NepaliDate("2081/04/32");

// Add or subtract days
var fiveDaysLater = nepDate.AddDays(5);       // 2081/05/05
var fiveDaysEarlier = nepDate.AddDays(-5);    // 2081/04/27

// Add or subtract months
var twoMonthsLater = nepDate.AddMonths(2);    // 2081/06/30
var twoMonthsEarlier = nepDate.AddMonths(-2); // 2081/02/32

// Fractional months
var twoAndHalfMonths = nepDate.AddMonths(2.5); // 2081/07/15

// Adjust away from month end when needed
var adjustedDate = nepDate.AddMonths(2, awayFromMonthEnd: true); // 2081/07/02

Date Comparison

using NepDate;

var date1 = NepaliDate.Parse("2079/12/16");
var date2 = DateTime.Now.ToNepaliDate();

// Equality comparison
if (date1 == date2) { /* dates are equal */ }

// Less than / greater than
if (date1 < date2) { /* date1 is earlier than date2 */ }
if (date1 > date2) { /* date1 is after date2 */ }

// Get time span between dates
var timeSpan = date2 - date1;  // TimeSpan object
// or
timeSpan = date2.Subtract(date1);

Simple Conversion

using NepDate;

// Convert DateTime to Nepali date string
string nepaliDate = DateTime.Now.ToNepaliDate().ToString();

// Convert Nepali date string to DateTime
DateTime englishDate = NepaliDate.Parse("2079/12/16").EnglishDate;

Bulk Conversion

var engDates = new List<DateTime>();
var nepDatesAsString = new List<string>();

// Convert a collection of English dates to Nepali dates
var nepDates = NepaliDate.BulkConvert.ToNepaliDates(engDates);

// Convert a collection of Nepali dates to English dates
var newEngDates = NepaliDate.BulkConvert.ToEnglishDates(nepDates);

// Convert a collection of Nepali date strings to English dates
var parsedEngDates = NepaliDate.BulkConvert.ToEnglishDates(nepDatesAsString);

🔄 Date Range Operations

Creating Date Ranges

using NepDate;

// Create a range between two dates
var start = new NepaliDate(2080, 1, 1);
var end = new NepaliDate(2080, 3, 15);
var range = new NepaliDateRange(start, end);

// Create a range for a single day
var singleDay = NepaliDateRange.SingleDay(start);

// Create a range with a specific number of days
var tenDays = NepaliDateRange.FromDayCount(start, 10);

// Create ranges for specific periods
var monthRange = NepaliDateRange.ForMonth(2080, 1);      // Full month
var fiscalYear = NepaliDateRange.ForFiscalYear(2080);    // Full fiscal year
var calendarYear = NepaliDateRange.ForCalendarYear(2080); // Full calendar year

// Get current period ranges
var currentMonth = NepaliDateRange.CurrentMonth();
var currentFiscalYear = NepaliDateRange.CurrentFiscalYear();
var currentCalendarYear = NepaliDateRange.CurrentCalendarYear();

Range Properties and Operations

var range = new NepaliDateRange(start, end);

// Basic properties
bool isEmpty = range.IsEmpty;     // Check if range is empty
int length = range.Length;        // Get number of days in range
var startDate = range.Start;      // Get start date
var endDate = range.End;         // Get end date

// Range operations
bool contains = range.Contains(someDate);           // Check if date is in range
bool containsRange = range.Contains(otherRange);    // Check if range contains another range
bool overlaps = range.Overlaps(otherRange);        // Check if ranges overlap
bool adjacent = range.IsAdjacentTo(otherRange);    // Check if ranges are adjacent

// Range manipulation
var intersection = range.Intersect(otherRange);    // Get intersection of two ranges
var excluded = range.Except(otherRange);           // Get range with another range excluded

Splitting and Iterating Ranges

var range = new NepaliDateRange(start, end);

// Split range by periods
var monthRanges = range.SplitByMonth();    // Split into month ranges
var quarterRanges = range.SplitByQuarter(); // Split into quarter ranges

// Iterate through dates
foreach (var date in range)  // Iterate all dates
{
    // Process each date
}

// Get specific date collections
var workingDays = range.WorkingDays();          // Get working days (excluding Saturdays)
var workingDaysNoSunday = range.WorkingDays(excludeSunday: true); // Exclude Sundays too
var weekendDays = range.WeekendDays();          // Get weekend days
var intervalDates = range.DatesWithInterval(7);  // Get dates with 7-day interval

Range Formatting

var range = new NepaliDateRange(start, end);

// Basic string representation
string basic = range.ToString();  // "2080/01/01 - 2080/03/15"

// Formatted string
string formatted = range.ToString(DateFormats.DayMonthYear, Separators.Dash);  // "01-01-2080 - 15-03-2080"

🖨️ Formatting & Display

Formatting Options

🗓️ Default 2079/02/06
📆 Custom 6-2-2079
📝 Long Friday, Jestha 6
📊 Unicode ०६.०२.२०७९
🌟 Nepali शुक्रबार, जेठ ६

Basic Formatting

using NepDate;

var nepDate = new NepaliDate("2079/02/06");

// Default format
string defaultFormat = nepDate.ToString();  // "2079/02/06"

// Custom format
string customFormat = nepDate.ToString(DateFormats.DayMonthYear, Separators.Dash, leadingZeros: false);  // "6-2-2079"

// Long date format
string longDate = nepDate.ToLongDateString(leadingZeros: false, displayDayName: true, displayYear: false);  // "Friday, Jestha 6"

// Nepali unicode digits
string nepaliDigits = nepDate.ToUnicodeString(DateFormats.DayMonthYear, Separators.Dot, leadingZeros: true);  // "०६.०२.२०७९"

// Long date in Nepali
string nepaliLongDate = nepDate.ToLongDateUnicodeString(leadingZeros: false, displayDayName: true, displayYear: false);  // "शुक्रबार, जेठ ६"

Smart Date Parsing

using NepDate;
using NepDate.Extensions;

// Parse with auto adjustment
var date1 = NepaliDate.Parse("2077_05_25", autoAdjust: true);  // 2077/05/25
var date2 = NepaliDate.Parse("25-05-077", autoAdjust: true);   // 2077/05/25
var date3 = NepaliDate.Parse("05.25.2077", autoAdjust: true);  // 2077/05/25

// Control month position
var date4 = NepaliDate.Parse("05/06/2077", autoAdjust: true);  // 2077/06/05
var date5 = NepaliDate.Parse("05/06/2077", autoAdjust: true, monthInMiddle: false);  // 2077/05/06

// Smart parser supports various formats
var date6 = SmartDateParser.Parse("15 Shrawan 2080");  // DD Month YYYY
var date7 = SmartDateParser.Parse("Shrawan 15, 2080");  // Month DD, YYYY
var date8 = SmartDateParser.Parse("15 Saun 2080");  // With alternate spelling
var date9 = SmartDateParser.Parse("२०८०/०४/१५");  // Nepali digits
var date10 = SmartDateParser.Parse("१५ श्रावण २०८०");  // Full Nepali format

// Extension method
var date11 = "15 Shrawan 2080".ToNepaliDate();

// Safe parsing
if ("15 Shrawan 2080".TryToNepaliDate(out var date12)) {
    // Use date12
}

💼 Fiscal Year Operations

Fiscal Year Support

Operation	Result	Time Period
Fiscal Year Start	2081/04/01	Beginning of fiscal year
Fiscal Year End	2082/03/31	End of fiscal year
Quarter Start	2081/04/01	Beginning of quarter
Quarter End	2081/06/30	End of quarter

using NepDate;

var nepDate = new NepaliDate("2081/04/15");

// For current date
var fyStartDate = nepDate.FiscalYearStartDate();  // 2081/04/01
var fyEndDate = nepDate.FiscalYearEndDate();  // 2082/03/31
var (start, end) = nepDate.FiscalYearStartAndEndDate();  // (2081/04/01, 2082/03/31)

// Quarter information
var qStartDate = nepDate.FiscalYearQuarterStartDate();  // 2081/04/01
var qEndDate = nepDate.FiscalYearQuarterEndDate();  // 2081/06/30
var (qStart, qEnd) = nepDate.FiscalYearQuarterStartAndEndDate();  // (2081/04/01, 2081/06/30)

// Static methods using fiscal year number
var fy2080Start = NepaliDate.GetFiscalYearStartDate(2080);  // 2080/04/01
var fy2080End = NepaliDate.GetFiscalYearEndDate(2080);  // 2081/03/31
var fy2080Quarter = NepaliDate.GetFiscalYearQuarterStartAndEndDate(2080, 1);  // (2081/01/01, 2081/03/31)

🔍 Advanced Features

Additional Helper Methods

using NepDate;

var nepDate = new NepaliDate("2079/12/16");

// Check if year is leap year
bool isLeap = nepDate.IsLeapYear();  // False/True

// Date comparison helpers
bool isToday = nepDate.IsToday();
bool isYesterday = nepDate.IsYesterday();
bool isTomorrow = nepDate.IsTomorrow();

// Safe parsing
if (NepaliDate.TryParse("2079/13/16", out var result)) {
    // use the result NepaliDate object
}

Serialization Support

Supporting Multiple Serialization Formats

JSON (String): "2080-04-15"
JSON (Object): {"Year":2080,"Month":4,"Day":15}
XML: Custom wrapper

System.Text.Json

using System.Text.Json;
using NepDate;
using NepDate.Serialization;

// Configure for string format (default)
var options = new JsonSerializerOptions()
    .ConfigureForNepaliDate();

// Or for object format
var objectOptions = new JsonSerializerOptions()
    .ConfigureForNepaliDate(useObjectFormat: true);

// Serialize
var date = new NepaliDate(2080, 4, 15);
string jsonString = JsonSerializer.Serialize(date, options);  // "2080-04-15"
string jsonObject = JsonSerializer.Serialize(date, objectOptions);  // {"Year":2080,"Month":4,"Day":15}

// Deserialize
var deserializedDate = JsonSerializer.Deserialize<NepaliDate>(jsonString, options);

Newtonsoft.Json

using Newtonsoft.Json;
using NepDate;
using NepDate.Serialization;

// Configure for string format (default)
var settings = new JsonSerializerSettings()
    .ConfigureForNepaliDate();

// Or for object format
var objectSettings = new JsonSerializerSettings()
    .ConfigureForNepaliDate(useObjectFormat: true);

// Serialize
var date = new NepaliDate(2080, 4, 15);
string jsonString = JsonConvert.SerializeObject(date, settings);  // "2080-04-15"
string jsonObject = JsonConvert.SerializeObject(date, objectSettings);  // {"Year":2080,"Month":4,"Day":15}

// Deserialize
var deserializedDate = JsonConvert.DeserializeObject<NepaliDate>(jsonString, settings);

XML Serialization

using System.Xml.Serialization;
using NepDate;
using NepDate.Serialization;

// Create a wrapper class for XML serialization
public class PersonWithDate
{
    public string Name { get; set; }

    // Use the XML serializer wrapper
    public NepaliDateXmlSerializer BirthDate { get; set; }

    // Helper property for convenience
    [XmlIgnore]
    public NepaliDate ActualBirthDate
    {
        get => BirthDate?.Value ?? default;
        set => BirthDate = new NepaliDateXmlSerializer(value);
    }
}

// Usage
var person = new PersonWithDate
{
    Name = "Ram Sharma",
    ActualBirthDate = new NepaliDate(2040, 2, 15)
};

var serializer = new XmlSerializer(typeof(PersonWithDate));
// Serialize to XML...

⚡ Performance

NepDate is up to 1000x faster than other libraries

NepDate is designed for exceptional performance, significantly outperforming other Nepali date libraries while using minimal memory.

Package `Method`	Mean (ns)	Error (ns)	StdDev (ns)	Rank	Allocated (B)
NepDate `BS -> AD`	62.59	0.295	0.261	1️⃣	-
NepDate `AD -> BS`	276.83	0.593	0.526	2️⃣	120
NepaliDateConverter.NETCORE `BS -> AD`	63,460.38	54.052	42.201	3️⃣	20176
NepaliDateConverter.NETCORE `AD -> BS`	186,610.23	420.217	350.901	7️⃣	20160
NepaliCalendarBS `BS -> AD`	99,511.43	247.038	231.080	5️⃣	159328
NepaliCalendarBS `AD -> BS`	113,258.50	364.280	340.748	6️⃣	158760
NepaliDateConverter.Net `BS -> AD`	75,327.75	269.244	251.851	4️⃣	20176
NepaliDateConverter.Net `AD -> BS`	212,478.96	4,192.698	5,877.576	8️⃣	20160

👥 Contributions

We welcome contributions from the community

Contributions are welcome! Please check out the CONTRIBUTING guide for more information on how you can help improve NepDate.

📝 Change Log

For a detailed list of changes in each release, visit the releases page.

Made with ❤️ by TheCrossLegCoder

Name		Name	Last commit message	Last commit date
Latest commit History 83 Commits
.github/ISSUE_TEMPLATE		.github/ISSUE_TEMPLATE
.idea/.idea.NepDate/.idea		.idea/.idea.NepDate/.idea
.vscode		.vscode
benchmarks		benchmarks
samples/NepDate.Samples		samples/NepDate.Samples
src		src
tests/NepDate.Tests		tests/NepDate.Tests
.gitattributes		.gitattributes
.gitignore		.gitignore
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
NepDate.sln		NepDate.sln
README.md		README.md
tatus -s		tatus -s

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NepDate - Fast & Efficient Nepali Date Library for .NET

Modern, High-Performance Bikram Sambat Date Operations for .NET Applications

📋 Table of Contents

📦 Installation

Using Package Manager Console

Using .NET CLI

✨ Key Features

🚀 Getting Started

Initialize NepaliDate

From Nepali year, month, and day values

From a string

From English DateTime

Get current Nepali date

Accessing Properties

📅 Date Operations

Adding and Subtracting Time

Date Comparison

Simple Conversion

Bulk Conversion

🔄 Date Range Operations

Creating Date Ranges

Range Properties and Operations

Splitting and Iterating Ranges

Range Formatting

🖨️ Formatting & Display

Formatting Options

Basic Formatting

Smart Date Parsing

💼 Fiscal Year Operations

Fiscal Year Support

🔍 Advanced Features

Additional Helper Methods

Serialization Support

Supporting Multiple Serialization Formats

System.Text.Json

Newtonsoft.Json

XML Serialization

⚡ Performance

NepDate is up to 1000x faster than other libraries

👥 Contributions

We welcome contributions from the community

📝 Change Log

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