"Claus Busch" wrote:
But is it so simple to divide the unix time by 86400
and add the unix start date? I think that PST and PDT
must be considered

There was no information to indicate whether the timestamp is local time or
GMT.

If the timestamp is GMT and "cate" wants local time, yes, some timezone
offset must be added or subtracted. But the same would be true of any
representation of GMT in the file.

On the other hand, if the timestamp is already local time, no timezone
offset is needed unless "cate" wants to convert it to GMT.