I have this problem and solutions in other question dont help.
<td>{{mail.RecordTime}}</td>
and
<td>{{mail.RecordTime | date:'yyyy-MM-dd HH:mm:ss Z'}}</td>
both give me unix time; /Date(1512978120087)/
when I try the other accepted answer as
<td>{{mail.RecordTime * 1000 | date:'yyyy-MM-dd HH:mm:ss Z'}}</td>
I get 0NaN-NaN-NaN NaN:NaN:NaN NaNNaN
Is there any other way to solve this problem?