Old exceptions should be zipped into an archive that has the date of the occurance as name

[paxuclus]

If archiveThreshold is greater than 0, it is possible for exceptions to land in an incorrect archive.

If for example the archiveThreshold is 9 and at 11:59:59PM there are 9 exceptions, they will be packed into the zip for the next day, as the threshold was not reached yet.

Instead, exceptions should be zipped based on their filemtime.