xpil:BirthDateTimePrecision

Specify the duration of the uncertainity period as a range where BirthDateTime is in the middle of the range. Uses xsd:duration as the data type. The time interval is in the format: PnYnMnDTnHnMnS
P: period (required), nY: number of years, nM: number of months, nD: number of days, T: start of a time section (required if hours, minutes or secords to be specified), nH: number of hours, nM: number of minutes, nS: number of seconds

P5Y -> period of 5 years
P5Y2M10D -> 5 years, 2 months, 10 days, and 15 hours