DateTimeRange, Business Day and various DateTime, DateTimeOffset, TimeSpan extension methods

Provides a testable abstraction and alternative to DateTime.Now / DateTime.UtcNow

Datetime, DateTimeOffset, TimeSpan starter code samples

C# time

A custom attribute for System.Text.Json that allows you to specify custom date formats for DateTime, DateTimeOffset, and their nullable counterparts during JSON serialization and deserialization.

DateTime Best Practices In .NET C#

Unix Time Stamp to .NET DateTime converter for Json.NET

High resolution clock

Simple C# extension methods to calculate the difference in months between two dates

Comparison of 'DateTimeOffset' and 'DateTime' in .Net and C#

FluentAssertions for DateTime, DateTimeOffset and TimeSpan.

A collection of helpful DateTimeOffset extension methods