The ASN.1 DATE type consists of a string value that has the form "YYYY-MM-DD", which represents a calendar date.
Day ::= DATE
Date ::= DATE myDay Date ::= "2012-12-21"
In BER, the DATE type value defined in the example above is encoded as follows:
1F1F 08 3230313231323231
The DATE type can be constrained by a single value, by type inclusion, by property constraints, and by time point range constraints.