TWebDBDateTimePicker Get and Set seconds since epoch format

The REST Server sends and receives Date and DateTime values in seconds since epoch (Jan 1, 1970) integer format.

How to use with the TWebDBDateTimePicker control?

I would suggest to create a calculated field of the type ftDateTime and write the code to convert the epoch time to TDateTime and vice versa and bind this calculated field to the TWebDBDateTimePicker.