"datetime": {
        "tags": {
            "del": {"description": "Date and (optionally) time of the change","value": "Valid date string with optional time"},
            "ins": {"description": "Date and (optionally) time of the change","value": "Valid date string with optional time"},
            "time": {"description": "Machine-readable value","value": "Valid month string, valid date string, valid yearless date string, valid time string, valid local date and time string, valid time-zone offset string, valid global date and time string, valid week string, valid non-negative integer, or valid duration string"}