DatePattern:
| { variant: "Any" }
| { variant: "Value"; value: CborDate }
| { variant: "Range"; min: CborDate; max: CborDate }
| { variant: "Earliest"; value: CborDate }
| { variant: "Latest"; value: CborDate }
| { variant: "StringValue"; value: string }
| { variant: "Regex"; pattern: RegExp }
Pattern for matching date values in dCBOR. Dates in CBOR are represented as tagged values with tag 1.