DateTimePlus

DateTimePlus is a lightweight extensions library for working with dates and times in .NET 9. It simplifies common operations that normally require repetitive or complex code, such as working with DateOnly, TimeOnly, DateTimeOffset, and date ranges.

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Main Features

1️⃣ DateOnlyExtensions

• Useful methods for working with DateOnly.
• Examples:
  • NextWeekday() → Gets the next business day.
  • AddBusinessDays(int days) → Adds business days skipping weekends.
  • DaysUntil(DateOnly date) → Calculates the difference in days.
  • MonthsUntil(DateOnly date) → Calculates the difference in months.

2️⃣ TimeOnlyExtensions

• Combines TimeOnly with DateOnly to obtain a DateTime.

3️⃣ DateTimeOffsetExtensions

• Powerful extensions for working with DateTimeOffset and time zones.
• Main methods:
  • StartOfDay() → Gets the start of the day (00:00:00) preserving the offset.
  • EndOfDay() → Gets the end of the day (23:59:59.999) preserving the offset.
  • IsToday(DateTimeOffset? reference) → Checks if the date is today.
  • IsPast(DateTimeOffset? reference) → Checks if the date is in the past.
  • IsFuture(DateTimeOffset? reference) → Checks if the date is in the future.
  • StartOfDayInTimeZone(TimeZoneInfo timeZone) → Gets the start of the day in a specific time zone.

4️⃣ TimeZoneHelper

• Utilities for time zone conversions.
• Main methods:
  • ConvertToTimeZone(DateTimeOffset dateTime, TimeZoneInfo destinationTimeZone) → Converts a date to another time zone.
  • ConvertToTimeZone(DateTimeOffset dateTime, string destinationTimeZoneId) → Converts using a time zone ID string.

5️⃣ DateRange

• Allows working with ranges of dates easily.
• Main methods:
  • Days() → Returns all days in the range.
  • BusinessDays() → Returns only business days.
  • Contains(DateOnly date) → Checks if a date is within the range.

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Installation

dotnet add package DateTimePlus --version 1.0.0

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Usage Examples

DateOnlyExtensions

var today = DateOnly.FromDateTime(DateTime.Now); var nextBusinessDay = today.NextWeekday(); var inTwoBusinessDays = today.AddBusinessDays(2);

TimeOnlyExtensions

var date = new DateOnly(2025, 1, 21); var time = new TimeOnly(14, 30); var dateTime = time.ToDateTime(date);

DateTimeOffsetExtensions

var now = DateTimeOffset.Now; // Get start and end of day var startOfDay = now.StartOfDay(); // Today at 00:00:00 var endOfDay = now.EndOfDay(); // Today at 23:59:59.999 // Check temporal relationships if (now.IsToday()) { /* ... */ } if (someDate.IsPast()) { /* ... */ } if (futureDate.IsFuture()) { /* ... */ } // Work with time zones var madridTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Central European Standard Time"); var startInMadrid = now.StartOfDayInTimeZone(madridTimeZone);

TimeZoneHelper

var utcNow = DateTimeOffset.UtcNow; // Convert to specific time zone var madridTime = TimeZoneHelper.ConvertToTimeZone(utcNow, "Central European Standard Time"); var newYorkTime = TimeZoneHelper.ConvertToTimeZone(utcNow, "Eastern Standard Time"); // Using TimeZoneInfo directly var timeZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time"); var pacificTime = TimeZoneHelper.ConvertToTimeZone(utcNow, timeZone);

DateRange

var start = new DateOnly(2025, 1, 1); var end = new DateOnly(2025, 1, 31); var range = new DateRange(start, end); // Get all days foreach (var day in range.Days()) { Console.WriteLine(day); } // Get only business days foreach (var businessDay in range.BusinessDays()) { Console.WriteLine(businessDay); } // Check if date is in range bool isInRange = range.Contains(new DateOnly(2025, 1, 15));

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Contributing

Contributions are welcome! Feel free to open issues or pull requests on GitHub.

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License

This project is licensed under the MIT License.