| CompareDate | Indicates the relationship between the date portions of two TDateTime values. |
| CompareDateTime | Indicates the relationship between two TDateTime values. |
| CompareTime | Indicates the relationship between the time portions of two TDateTime values. |
| DateInRange | Checks whether a TDate value is in range. |
| DateOf | Strips the time portion from a TDateTime value. |
| DateTimeInRange | Checks whether a TDateTime value is in range. |
| DateTimeToJulianDate | Converts a TDateTime value into a Julian date. |
| DateTimeToMilliseconds | |
| DateTimeToModifiedJulianDate | Converts a TDateTime value into a modified Julian date. |
| DateTimeToUnix | Converts a TDateTime value into a Unix/Linux-style date-and-time value. |
| DateToISO8601 | Converts the ADate date-and-time value, specified in the TDateTime format, into a string containing a date-and-time value in the ISO 8601 format. |
| DayOf | Returns the day of the month represented by a TDateTime value. |
| DayOfTheMonth | Returns the day of the month represented by a TDateTime value. |
| DayOfTheWeek | Returns the day of the week represented by a TDateTime value. |
| DayOfTheYear | Returns the number of days between a specified TDateTime value and December 31 of the previous year. |
| DaysBetween | Returns the number of whole days between two specified TDateTime values. |
| DaysInAMonth | Returns the number of days in a specified month of a specified year. |
| DaysInAYear | Returns the number of days in a specified year. |
| DaysInMonth | Returns the number of days in the month of a specified TDateTime value. |
| DaysInYear | Returns the number of days in the year of a specified TDateTime value. |
| DaySpan | Returns the number of days (including fractional days) between two specified TDateTime values. |
| DecodeDateDay | Returns the year and day of the year for a specified TDateTime. |
| DecodeDateMonthWeek | Returns the year, month, week of the month, and day of the week for a specified TDateTime. |
| DecodeDateTime | Returns Year, Month, Day, Hour, Minute, Second, and Millisecond values for a TDateTime. |
| DecodeDateWeek | Returns the year, week of the year, and day of the week for a specified TDateTime value object. |
| DecodeDayOfWeekInMonth | For a given TDateTime value, returns the year, month, day of the week, and the count of that day of the week in the month. |
| EncodeDateDay | Returns a TDateTime that represents a specified day of the year for a specified year. |
| EncodeDateMonthWeek | Returns a TDateTime that represents a specified day of a specified week in a specified month and year. |
| EncodeDateTime | Returns a TDateTime that represents a specified year, month, day, hour, minute, second, and millisecond. |
| EncodeDateWeek | Returns a TDateTime that represents a specified day of a specified week in a specified year. |
| EncodeDayOfWeekInMonth | Returns a TDateTime that represents a specified occurrence of a day of the week within a specified month and year. |
| EndOfADay | Returns a TDateTime that represents the last millisecond of a specified day. |
| EndOfAMonth | Returns a TDateTime that represents the last millisecond of the last day of a specified month. |
| EndOfAWeek | Returns a TDateTime object value that represents the last millisecond of a specified day of a specified week. |
| EndOfAYear | Returns a TDateTime that represents the last millisecond of a specified year. |
| EndOfTheDay | Returns a TDateTime that represents the last millisecond of the day identified by a specified TDateTime. |
| EndOfTheMonth | Returns a TDateTime that represents the last millisecond of the last day of the month identified by a specified TDateTime. |
| EndOfTheWeek | Returns a TDateTime that represents the last millisecond of the last day of the week identified by a specified TDateTime. |
| EndOfTheYear | Returns a TDateTime that represents the last millisecond of the last day of the year identified by a specified TDateTime. |
| HourOf | Returns the hour of the day represented by a TDateTime value. |
| HourOfTheDay | Returns the hour of the day represented by a TDateTime value. |
| HourOfTheMonth | Returns the number of hours between a specified TDateTime value and 12:00 A.M. of the first day of the month. |
| HourOfTheWeek | Returns the number of hours between a specified TDateTime value and 12:00 A.M. of the first day of the week. |
| HourOfTheYear | Returns the number of hours between a specified TDateTime value and 12:00 A.M. of the first day of the year. |
| HoursBetween | Returns the number of whole hours between two specified TDateTime values. |
| HourSpan | Returns the number of hours (including fractional hours) between two specified TDateTime values. |
| IncDay | Returns a date shifted by a specified number of days. |
| IncHour | Returns a date/time value shifted by a specified number of hours. |
| IncMilliSecond | Returns a date/time value shifted by a specified number of milliseconds. |
| IncMinute | Returns a date/time value shifted by a specified number of minutes. |
| IncSecond | Returns a date/time value shifted by a specified number of seconds. |
| IncWeek | Returns a date shifted by a specified number of weeks. |
| IncYear | Returns a date shifted by a specified number of years. |
| InvalidDateDayError | InvalidDateDayError is used internally. |
| InvalidDateMonthWeekError | InvalidDateMonthWeekError is used internally. |
| InvalidDateTimeError | InvalidDateTimeError is used internally. |
| InvalidDateWeekError | InvalidDateWeekError is used internally. |
| InvalidDayOfWeekInMonthError | InvalidDayOfWeekInMonthError is used internally. |
| IsAM | Indicates whether the time portion of a specified TDateTime value occurs before noon. |
| IsInLeapYear | Indicates whether a specified TDateTime value occurs in a leap year. |
| ISO8601ToDate | Converts the AISODate date-and-time value, specified in the ISO 8601 format, into the date-and-time value in the TDateTime format. |
| IsPM | Indicates whether the time portion of a specified TDateTime value occurs in the afternoon. |
| IsSameDay | Indicates whether a specified TDateTime value occurs on a the same day as a criterion date. |
| IsToday | Indicates whether a specified TDateTime value occurs on the current date. |
| IsValidDate | Indicates whether a specified year, month, and day represent a valid date. |
| IsValidDateDay | Indicates whether a specified year and day of the year represent a valid date. |
| IsValidDateMonthWeek | Indicates whether a specified year, month, week of the month, and day of the week represent a valid date. |
| IsValidDateTime | Indicates whether a specified year, month, day, hour, minute, second, and millisecond represent a valid date and time. |
| IsValidDateWeek | Indicates whether a specified year, week of the year, and day of the week represent a valid date. |
| IsValidTime | Indicates whether a specified hour, minute, second, and millisecond represent a valid date and time. |
| JulianDateToDateTime | Converts a Julian date to a TDateTime value. |
| MilliSecondOf | Returns the millisecond of the second represented by a TDateTime value. |
| MilliSecondOfTheDay | Returns the number of milliseconds between a specified TDateTime value and the beginning of the same day. |
| MilliSecondOfTheHour | Returns the number of milliseconds between a specified TDateTime value and the beginning of the same hour. |
| MilliSecondOfTheMinute | Returns the number of milliseconds between a specified TDateTime value and the beginning of the same minute. |
| MilliSecondOfTheMonth | Returns the number of milliseconds between a specified TDateTime value and the beginning of the month. |
| MilliSecondOfTheSecond | Returns the millisecond of the second represented by a TDateTime value. |
| MilliSecondOfTheWeek | Returns the number of milliseconds between a specified TDateTime value and 12:00:00:00 A.M. of the first day of the week. |
| MilliSecondOfTheYear | Returns the number of milliseconds between a specified TDateTime value and 12:00:00:00 A.M. of the first day of the year. |
| MilliSecondsBetween | Returns the number of milliseconds between two specified TDateTime values. |
| MilliSecondSpan | Returns the number of milliseconds between two specified TDateTime values. |
| MinuteOf | Returns the minute of the hour represented by a TDateTime value. |
| MinuteOfTheDay | Returns the number of minutes between a specified TDateTime value and 12:00 A.M. of the same day. |
| MinuteOfTheHour | Returns the number of minutes between a specified TDateTime value and the beginning of the same hour. |
| MinuteOfTheMonth | Returns the number of minutes between a specified TDateTime value and 12:00 A.M. of the first day of the month. |
| MinuteOfTheWeek | Returns the number of minutes between a specified TDateTime value and 12:00 A.M. of the first day of the week. |
| MinuteOfTheYear | Returns the number of minutes between a specified TDateTime value and 12:00 A.M. of the first day of the year. |
| MinutesBetween | Returns the number of minutes between two specified TDateTime values. |
| MinuteSpan | Returns the number of minutes, including fractions thereof, between two specified TDateTime values. |
| ModifiedJulianDateToDateTime | Converts a modified Julian date to a TDateTime value. |
| MonthOf | Returns the month of the year represented by a TDateTime value. |
| MonthOfTheYear | Returns the month of the year represented by a TDateTime value. |
| MonthsBetween | Returns the approximate number of months between two specified TDateTime values. |
| MonthSpan | Returns the approximate number of months, including fractions, between two specified TDateTime values. |
| NthDayOfWeek | Returns the weekday of the specified TDateTime value. |
| RecodeDate | Selectively replaces the date parts of a specified TDateTime value. |
| RecodeDateTime | Selectively replaces parts of a specified TDateTime value. |
| RecodeDay | Replaces the day of the month for a specified TDateTime value. |
| RecodeHour | Replaces the hour of the day for a specified TDateTime value. |
| RecodeMilliSecond | Replaces the millisecond of the second for a specified TDateTime value. |
| RecodeMinute | Replaces the minute of the hour for a specified TDateTime value. |
| RecodeMonth | Replaces the month of the year for a specified TDateTime value. |
| RecodeSecond | Replaces the second of the minute for a specified TDateTime value. |
| RecodeTime | Selectively replaces the time parts of a specified TDateTime value. |
| RecodeYear | Replaces the year for a specified TDateTime value. |
| SameDate | Indicates whether two TDateTime values represent the same year, month, and day. |
| SameDateTime | Indicates whether two TDateTime values represent the same year, month, day, hour, minute, second, and millisecond. |
| SameTime | Indicates whether two TDateTime values represent the same time of day, ignoring the date portion. |
| SecondOf | Returns the second of the minute represented by a TDateTime value. |
| SecondOfTheDay | Returns the number of seconds between a specified TDateTime value and 12:00:00 A.M. of the same day. |
| SecondOfTheHour | Returns the number of seconds between a specified TDateTime value and the beginning of the same hour. |
| SecondOfTheMinute | Returns the number of seconds between a specified TDateTime value and the beginning of the same minute. |
| SecondOfTheMonth | Returns the number of seconds between a specified TDateTime value and 12:00:00 A.M. on the first day of the month. |
| SecondOfTheWeek | Returns the number of seconds between a specified TDateTime value and 12:00:00 A.M. of the first day of the week. |
| SecondOfTheYear | Returns the number of seconds between a specified TDateTime value and 12:00:00 A.M. on the first day of the year. |
| SecondsBetween | Returns the number of seconds between two specified TDateTime values. |
| SecondSpan | Returns the number of seconds (including fractions thereof) between two specified TDateTime values. |
| StartOfADay | Returns a TDateTime that represents 12:00:00:00 A.M. on a specified day. |
| StartOfAMonth | Returns a TDateTime that represents 12:00:00:00 A.M. on the first day of a specified month. |
| StartOfAWeek | Returns a TDateTime that represents the first moment on a specified day of a specified week. |
| StartOfAYear | Returns a TDateTime that represents the first moment on the first day of a specified year. |
| StartOfTheDay | Returns a TDateTime that represents 12:00:00:00 A.M. on the day identified by a specified TDateTime. |
| StartOfTheMonth | Returns a TDateTime that represents 12:00:00:00 A.M. on the first day of the month identified by a specified TDateTime. |
| StartOfTheWeek | Returns a TDateTime that represents 12:00:00:00 A.M. on the first day of the week identified by a specified TDateTime. |
| StartOfTheYear | Returns a TDateTime that represents 12:00:00:00 A.M. on the first day of the year identified by a specified TDateTime. |
| TimeInRange | Checks whether a TDateTime value is in range. |
| TimeOf | Strips the date portion from a TDateTime value. |
| TimeToMilliseconds | |
| Today | Returns a TDateTime value that represents the current date. |
| Tomorrow | Returns a TDateTime value that represents the following day. |
| TryEncodeDateDay | Calculates the TDateTime value that represents a specified day of the year for a specified year. |
| TryEncodeDateMonthWeek | Calculates the TDateTime value that represents a specified day of a specified week in a specified month and year. |
| TryEncodeDateTime | Calculates the TDateTime value that represents a specified year, month, day, hour, minute, second, and millisecond. |
| TryEncodeDateWeek | Calculates the TDateTime value that represents a specified day of a specified week in a specified year. |
| TryEncodeDayOfWeekInMonth | Calculates a TDateTime that represents a specified occurrence of a day of the week within a specified month and year. |
| TryISO8601ToDate | Tries to convert the provided date-and-time value, specified in the ISO 8601 format, into the date-and-time value in the TDateTime format. Returns True if the conversion succeeds. |
| TryJulianDateToDateTime | Converts a Julian date to a TDateTime value. |
| TryModifiedJulianDateToDateTime | Converts a modified Julian date to a TDateTime value. |
| TryRecodeDateTime | Selectively replaces parts of a specified TDateTime value. |
| UnixToDateTime | Converts a Unix/Linux style date-and-time value to a TDateTime value. |
| WeekOf | Returns the week of the year represented by a TDateTime value. |
| WeekOfTheMonth | Returns the week of the month represented by a TDateTime value. |
| WeekOfTheYear | Returns the week of the year represented by a TDateTime value. |
| WeeksBetween | Returns the number of whole weeks between two specified TDateTime values. |
| WeeksInAYear | Returns the number of weeks in a specified year. |
| WeeksInYear | Returns the number of weeks in the year of a specified TDateTime value. |
| WeekSpan | Returns the number of weeks (including fractional weeks) between two specified TDateTime values. |
| WithinPastDays | Indicates whether two dates are within a specified number of days of each other. |
| WithinPastHours | Indicates whether two date/time values are within a specified number of hours of each other. |
| WithinPastMilliSeconds | Indicates whether two date/time values are within a specified number of milliseconds of each other. |
| WithinPastMinutes | Indicates whether two date/time values are within a specified number of minutes of each other. |
| WithinPastMonths | Indicates whether two date/time values are within a specified number of months of each other. |
| WithinPastSeconds | Indicates whether two date/time values are within a specified number of seconds of each other. |
| WithinPastWeeks | Indicates whether two date/time values are within a specified number of weeks of each other. |
| WithinPastYears | Indicates whether two date/time values are within a specified number of years of each other. |
| YearOf | Returns the year represented by a TDateTime value. |
| YearsBetween | Returns the approximate number of years between two specified TDateTime values. |
| YearSpan | Returns the approximate number of years (including fractions thereof) between two specified TDateTime values. |
| Yesterday | Returns a TDateTime value that represents the preceding day. |