- getDays
A positive integer, followed by the character "D", which indicated the number of
days in the period.
- getDesignator
A mandatory element which designates that the returned string represents the
duration of a period.
- getHours
A positive integer, followed by the character "H", which indicated the number of
hours in the period
- getMinutes
A positive integer, followed by the character "M", which indicated the number of
minutes in the peri
- getMonths
A positive integer, followed by the character "M", which indicated the number of
months in the perio
- getSeconds
A positive integer, followed by the character "S", which indicated the number of
seconds in the peri
- getTimeIndicator
Included whenever the sequence includes values for units less than a day.