Introduce time related property types #24
Description
- DATE: A date value in CCYY-MM-DD format
- TIME: A time value in hh:mm:ss format
- DATETIME: A date and time value inCCYY-MM-DD hh:mm:ss format
- TIMESTAMP: A timestamp value in CCYY-MM-DD hh:mm:ss format
- YEAR: A year value in CCYY or YY format