How to convert a field TIMESTAMP in field time?

A field (digital) TIMESTAMP stores the number of seconds since 01/01/1970.To create a timestamp from the 
date field in MyReport Data, use the formula: CurrToDate (Trunc ([timestamp] / 86400) 25569)
Explanation:- Timestamp/86400: number of days since 01/01/1970.  25569: numeric value of the date 01/01/1970.