When do I need to re-calculate planning - by: clarezoe

Hi,

A basic question that I cannot find anywhere, hope someone can explain.

I know that I need to re-calculate planning when I have added some tasks resources etc, but what exactly are the occasions that I need to re-calculate? For example, if some resource has entered real work, do I have to re-calculate it or maybe set up a cron task? also when I re-calculate, do I choose the project start date or the current date? I read in the forum somewhere that it is suggested to choose the current date to re-calculate, why? What does the system when I do the recalculation? What has been calculated?

Thanks!