> ## Class BirtDuration

> The BirtDuration class provides functions to get parts of time periods, or durations, used in XML documents. The durations are specified in the following form:

> P nYnMnDTnHnMnS

> where:

> n | P indicates the period (required)

> n | nY indicates the number of years

> n | nM indicates the number of months

> n | nD indicates the number of days

> n | T indicates the start of a time section (required if the duration includes hours, minutes, or seconds)

> n | nH indicates the number of hours

> n | nM indicates the number of minutes

> n | nS indicates the number of seconds

> For example, the following value indicates a duration of 2 years, 3 months, and 5 days:

> P2Y3M5D

> The following value indicates a duration of 10 hours:

> PT10H

> The BirtDuration class is static. The application cannot create instances of the class.

> ### BirtDuration.day

> This function returns the days value of a given duration.

> Syntax

> BirtDuration.day( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the days value.

> Returns

> A number that represents the days value of the specified duration.

> Examples

> The following examples show the day values returned for specific durations:

> BirtDuration.day( "P1Y15DT12H" ) // returns 15
> BirtDuration.day( "P5Y2M" ) // returns 0

> ### BirtDuration.hour

> This function returns the hours value of a given duration.

> Syntax

> BirtDuration.hour( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the hours value.

> Returns

> A number that represents the hours value of the specified duration.

> Examples

> The following examples show the hour values returned for specific durations:

> BirtDuration.hour( "P1Y15DT12H" ) // returns 12
> BirtDuration.hour( "P5Y2M" ) // returns 0

> ### BirtDuration.isLongerThan

> This function tests if a duration is longer than another duration. Sometimes the order relationship between certain durations cannot be determined, for example, one month (P1M) and 30 days (P30D), or one year (P1Y) and 365 days (P365D). In cases such as these, the function returns false.

> Syntax

> BirtDuration.isLongerThan( lexicalDuration1, lexicalDuration2 )

> Parameters

> lexicalDuration1

> The first duration to use in the comparison.

> lexicalDuration2

> The second duration to use in the comparison.

> Returns

> True if the first duration is longer than the second duration; returns false otherwise.

> Examples

> The following expressions compare the lengths of specific durations:

> BirtDuration.isLongerThan( "P1Y3M" , "P13M" ) // returns true
> BirtDuration.isLongerThan( "P2M" , "P62D" ) // returns false
> BirtDuration.isLongerThan( "PT25H" , "P1D" ) // returns true

> ### BirtDuration.isShorterThan

> This function tests if a duration is shorter than another duration. Sometimes the order relationship between certain durations cannot be determined, for example, one month (P1M) and 30 days (P30D), or one year (P1Y) and 365 days (P365D). In cases such as these, the function returns false.

> Syntax

> BirtDuration.isShorterThan( lexicalDuration1, lexicalDuration2 )

> Parameters

> lexicalDuration1

> The first duration to use in the comparison.

> lexicalDuration2

> The second duration to use in the comparison.

> Returns

> True if the first duration is shorter than the second duration; returns false otherwise.

> Examples

> The following expressions compare the lengths of specific durations:

> BirtDuration.isShorterThan( "P1Y3M" , "P13M" ) // returns false
> BirtDuration.isShorterThan( "P2M" , "P62D" ) // returns false
> BirtDuration.isShorterThan( "PT25H" , "P1D" ) // returns false
> BirtDuration.isShorterThan( "P27D" , "P1M" ) // returns true

> ### BirtDuration.minute

> This function returns the minutes value of a given duration.

> Syntax

> BirtDuration.minute( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the minutes value.

> Returns

> A number that represents the minutes value of the specified duration.

> Examples

> The following examples show the minutes values returned for specific durations:

> BirtDuration.minute( "P1Y15DT12H30M45S" ) // returns 30
> BirtDuration.minute( "P5Y2M8DT15H" ) // returns 0

> ### BirtDuration.month

> This function returns the months value of a given duration.

> Syntax

> BirtDuration.month( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the months value.

> Returns

> A number that represents the months value of the specified duration.

> Examples

> The following examples show the month values returned for specific durations:

> BirtDuration.month( "P1Y3M15DT12H30M45S" ) // returns 3
> BirtDuration.month( "P5Y8DT15H" ) // returns 0

> ### BirtDuration.second

> This function returns the seconds value of a given duration.

> Syntax

> BirtDuration.second( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the seconds value.

> Returns

> A number that represents the seconds value of the specified duration.

> Examples

> The following examples show the seconds values returned for specific durations:

> BirtDuration.second( "P1Y3M15DT12H30M45S" ) // returns 5
> BirtDuration.second( "P5Y8DT15H" ) // returns 0

> ### BirtDuration.timeInMills

> This function returns the number of milliseconds in a given duration, from a specified start date. The number of milliseconds in a duration can change depending on the start date. For example, a duration of one month can be 28, 29, 30, or 31 days, depending on the start date. If the start date is January 1, the function calculates the milliseconds between January 1 and February 1 (excluding February 1), which equals 2678400000 milliseconds or 31 days. If the start date is February 1, 2009 (a leap year), the function calculates the milliseconds between February 1 and March 1, which equals 2505600000 milliseconds or 29 days.

> Syntax

> BirtDuration.timeInMills( lexicalDuration, startDate )

> Parameters

> lexicalDuration

> A duration whose length in milliseconds to get.

> startDate

> A date object that represents the start date.

> Returns

> The number of milliseconds in the specified duration.

> Examples

> The following examples show the number of milliseconds returned for specific durations and start dates:

> BirtDuration.timeInMills( "P1Y3M10D" , "2009-01-01" ) // returns 40172400000
> BirtDuration.timeInMills( "P1Y3M10D" , "2008-01-01" ) // returns 40258800000
> BirtDuration.timeInMills( "PT6H45M20S" , "2009-01-01" ) // returns 24320000

> ### BirtDuration.year

> This function returns the year value of a given duration.

> Syntax

> BirtDuration.year( lexicalDuration )

> Parameter

> lexicalDuration

> A duration from which to get the year value.

> Returns

> A number that represents the year value of the specified duration.

> Examples

> The following examples show the year values returned for specific durations:

> BirtDuration.year( "P1Y3M15DT12H30M45S" ) // returns 1
> BirtDuration.year( "P8DT15H" ) // returns 0

(c) Copyright Actuate Corporation 2009