| Add | Adds a time-span to the date and time |
| AddDays | Adds a number of days to the date/time |
| AddHours | Adds a number of hours to the date/time |
| AddMilliseconds | Adds a number of milliseconds to the date/time |
| AddMinutes | Adds a number of minutes to the date/time |
| AddMonths | Adds a number of months to the date/time |
| AddSeconds | Adds a number of seconds to the date/time |
| AddTicks | Adds a number of ticks to the date/time |
| AddYears | Adds a number of years to the date/time |
| Compare | Compares two DateTime values |
| CompareTo | Compares the current DateTime value to another |
| DaysInMonth | Returns the number of days in the specified month of the specified year. |
| Equals | Returns true if DateTime values are exactly the same |
| IsLeapYear | Determines whether a year is a leap year |
| Parse | Converts a string representation of date and time into a DateTime value |
| ParseExact | Converts a string representation of date and time into a DateTime value |
| Subtract | Subtract a DateTime or TimeSpan from the current DateTime value |
| ToLongDateString | Converts the current DateTime to a long date format string |
| ToLongTimeString | Converts the current DateTime to a long time format string |
| ToShortDateString | Converts the current DateTime to a short date format string |
| ToShortTimeString | Converts the current DateTime to a short time format string |
| ToString | Converts the current DateTime to a string |