Petr Havlík February 2016
Depending on what EPOCH format you use, this formula will do the trick:
DATEADD('second', [EPOCH FORMAT TIME], DATE('1/1/1970'))
For your example value of 1452011400 will return Jan 5, 2016 - 4.30pm.
Keep in mind there are two EPOCH formats, so make sure you use the correct one: The Unix epoch is typically 1/1/1970, while the Microsoft COM epoch is 12/30/1899.
I have used Unix format in my example above (the last argument to DATEADD funciton).