The dtl data type

Scalar data type. The date and time in the company-specific time zone.

Date literals use the ISO 8601 international date format for complete date plus hours, minutes, and seconds.

...
<datepicker date='{(DTL 2015-12-18T10:15:00)}'
  dateFormat='(dtf yyyy"-"MM"-"dd)'/>
...
The date property of the datepicker is set using a date literal

Figure 268. The date property of the datepicker is set using a date literal