The C# date classes provide various options for handling and manipulating date data in applications. The DateTime class is the most commonly used, representing a specific date and time with properties and methods for operations like formatting and adding/subtracting time intervals. The DateTimeOffset class includes information about the time zone offset, making it more useful when working across different time zones. The TimeSpan class represents a duration of time rather than a specific date and time, allowing calculations involving dates and times. These classes provide various methods for getting the current date and time, adding or subtracting time intervals from a date, converting time zones, handling daylight saving time, and parsing dates from strings. Understanding the different date classes, their formats, parameters, and methods is essential to create powerful and reliable date and time functionality in C# applications.