With the File Expansion Project (FEP) in 2014 we introduced new formats for date fields in the account and transaction database tables.  Referred to as the "ISO date format," dates with this format can easily be used in search and selection criteria, as well as in calculations (such as the number of days between dates, etc.).  

In the past, a date field that didn't have any data entered into it was simply blank.  But with the ISO date format, a "null" date, meaning no date has been recorded, is represented as 0001-01-01.  

Use the link below for tips on how to enter selection criteria for ISO-formatted date fields.