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December

 * 21st December - Earliest possible date for the Battle of Bellatrix. Dalek forces engage the Earth Alliance's Spacefleet at Bellatrix. At the end of the battle, Admiral Summerfield's battleship, the Tisiphone, falls into a spatio-temporal rift and is transported to 1963 Earth.
 * Date is conjecture, based on Benny being 7 when her father disappeared (NA: Return of the Living Dad), 8 when her mother died (BFBS:The Extinction Event), that the two events were six months apart (BFBS: Missing Adventures:The Evacuation of...), and that Benny's birthday is 21st June. (BFBS: Just War))