The type xsd:duration represents a duration of time expressed as a number of years, months, days, hours, minutes, and seconds. The format of xsd:duration is PnYnMnDTnHnMnS, where P is a literal value that starts the expression, nY is the number of years followed by a literal Y, nM is the number of months followed by a literal M, nD is the number of days followed by a literal D, T is a literal value that separates the date and time, nH is the number of hours followed by a literal H, nM is the number of minutes followed by a literal M, and nS is the number of seconds followed by a literal S. The following rules apply to xsd:duration values:
Any of these numbers and corresponding designators may be absent if they are equal to 0, but at least one number and designator must appear.
The numbers may be any unsigned integer, with the exception of the number of seconds, which may be an unsigned decimal number.
If a decimal point appears in the number of seconds, there must be at least one digit after the decimal point.
A minus sign may appear before the P to specify a negative duration.
If no time items (hour, minute, second) are present, the letter T must not appear.
Examples:
- P2Y6M5DT12H35M30S 2 years, 6 months, 5 days, 12 hours, 35 minutes, 30 seconds
- PT20M 20 minutes
