Yeah well, I have looked this up and found the MySQL to make this work

It’s not that hard.
I have created a new field named timestamp and then I just needed to update the timestamp field with the unix timestamp value based on the date field
[tt]UPDATE `table_name` SET `timestamp`=unix_timestamp(`date`) [/tt]
Given the way dates were recorded, I had to do a little search and replace to change the date format I had [tt]2001-01-15[/tt] into the proper one [tt]2001-01-15 00:00:00[/tt] (since I had no hours, minutes and second, I choose to set all to midnight). For some reason it didn’t work with the short date (documentation seems to indicate it should work but it didn’t...).