These cases cover the examples of EDTF level 0 dates, datetimes, and time intervals given at https://www.loc.gov/standards/datetime/.
Level 0 requires support for the following features.
Date and time (see rules)
- calendar date and (local) time of day
- calendar date and UTC time of day
- calendar date
- reduced precision date (year and month only)
- reduced precision date (year only)
Date and time relative to (shifted from) UTC (see rules)
Time interval (see rules)
- time interval with year precision
- time interval with month precision
- time interval with day precision
- time interval starting with day precision and ending with month precision
- time interval starting with day precision and ending with year precision
- time interval starting with year precision and ending with month precision