Recently I wrote about the possibility of praying across time.
For example, you might pray for the salvation of a person who has already died.
The theory is that, since God is outside of time, he is aware of your prayer in the eternal now and can intervene at any point in history, including when the person your are praying for was still alive.
Read the rest here
Affecting the Past today
Affecting the Past today
Devotion to the souls in Purgatory contains in itself all the works of mercy, which supernaturalized by a spirit of faith, should merit us Heaven. de Sales