Support O*Net date modified for Tasks and Occupations
Allow looser rules for dates
Approximate Date Modified
The value should be in ISO 8601 date format; specifically YYYY or YYYY-MM.
Values may be just a year (e.g. 2026) or a year and a month (e.g. (2026-05). If the full date, i.e. year, month and day, are known use ceasn:dateModified.
Approximate date on which this resource was most recently modified in some way.