Date/Time routines

Date/Time routines

DELPHI RTL Reference

CompareDate function

Compares two TDateTime values (returns "less", "equal" or "greater"). Ignores the Time part if both values "fall" on the same day.

CompareDateTime function

Compares two TDateTime values (returns "less", "equal" or "greater").

CompareTime function

Compares two TDateTime values (returns "less", "equal" or "greater"). Ignores the Date part if both values occur at the same time.

Date function

Returns the current system date.

DateToStr function

Converts a TDateTime value to a string (date part only).

DateTimeToFileDate function

Converts a TDateTime value to a system timestamp value.

DateTimeToStr function

Converts a TDateTime value to a string (date and time).

DateOfWeek function

Returns the day of the week for a given date.

DateOfTheWeek function

Returns the day of the week for a given TDateTimeValue.

DayOfTheMonth function

Returns the day of the month from a given TDateTime value (from 1 to 31)

DayOfTheYear function

Returns the the ordinal position of a TDateTime value's day within its year.

DaySpan function

Gives the number of days (including fractional days) between two specified dates.

DaysBetween function

Gives the number of whole days between two specified dates.

DateOf function

Returns only the Date portion of the TDateTime value, by setting Time part to 0.

DecodeDate function

Separates Year, Month, and Day values from a TDateTime value.

DecodeTime procedure

Separates Hour, Minute, Second, and MilliSecond values from a TDateTime value.

EncodeDate function

Creates a TDateTime value from Year, Month, and Day values.

EncodeTime function

Creates a TDateTime value from Hour, Min, Sec, and MSec. values.

FormatDateTime function

Formats a TDateTime value to a string.

HourOf function

Returns the hour of the day represented by a TDateTime value.

IncDay function

Adds or substracts a given number of days from a date value.

IncMonth function

Adds or substracts a given number of months from a date value.

IsLeapYear function

Returns True if a year specified is a leap year.

IsPM function

Returns true if the time portion of a TDateTime value occurs on or after 12:00 (noon) and before 24:00 (midnight).

Now function

Returns the current system date and time.

Time function

Returns the current system time.

TimeToStr function

Converts a TDateTime value to a string (time part).

TimeOf function

Returns only the Time portion of the TDateTime value, by setting Date part to 0.

WithinPastDays function

Returns true if two dates are within a specified number of days of each other.

WithinPastYears function

Returns true if two dates are within a specified number of years of each other.

YearsBetween function

Gives the number of whole years between two specified dates.

more to come...

sumber:

http://delphi.about.com/od/beginners/l/blrtldatetime.htm