| AddDays | Add a number of Days to a DateTime value |
| AddHours | Add a number of Hours to a DateTime value |
| AddMilliSeconds | Add a number of MilliSeconds to a DateTime value |
| AddMinutes | Add a number of Minutes to a DateTime value |
| AddMonths | Add a number of Months to a DateTime value |
| AddSeconds | Add a number of Seconds to a DateTime value |
| AddWeeks | Add a number of Weeks to a DateTime value |
| AddYears | Add a number of Years to a DateTime value |
| GetDayOfMonth | Return the DateTime Day of month according to the current Calendar |
| GetDayOfWeek | Gets the specified DateTime Day of Week according to the current culture |
| GetDayOfYear | Gets the specified DateTime Day of Year according to the current culture |
| GetDaysInMonth | Gets the number of Days in a Month/Year according to the current Calendar |
| GetDaysInYear | Gets the number of Days in a Year according to the current Calendar |
| GetEra | Return the specified DateTime Era according to the current Calendar |
| GetHour | Gets the specified DateTime Hour |
| GetMilliSeconds | Gets the specified DateTime MilliSeconds |
| GetMinute | Gets the specified DateTime Minute |
| GetMonth | Return the specified DateTime Month according to the current Calendar |
| GetMonthsInYear | Gets the number of Months in a Year according to the current Calendar |
| GetSecond | Gets the specified DateTime Seconds |
| GetWeekOfYear | Return the DateTime Week of Year according to the current Calendar |
| GetYear | Return the specified DateTime Year according to the current Calendar |
| IsLeapMonth | Is specified Year/Month a leap Month according to the current Calendar? |
| IsLeapYear | Is specified Year a leap Year according to the current Calendar? |
| ToDateTime | Builds a DateTime object from year, month, day and time values |
| ToFourDigitYear | Converts a 2 digit year safely to a 4 digit year for the current Calendar |