The invasion took place on June 6, 1944. vs After, the invasion took place on June 6, 1944.

Some examples from the web:

• On June 6, 1944, the day that will come to be known as D-Day finally arrives.
• But as soon as the invasion took place, he rushed to be with his men.
• The incident took place on June the 9th, 2007.
• There was an accident on June 6, 1995.
• There was an accident on June 6, 1995.
• These murders took place on June 9, 1912, in Villisca, Iowa.
• Sampson Brush Company regional manager filed a theft report on June 9 alleging Roy checked out company property on June 6, then took off with money collected from customers.
• Hitler moved into Hungary on March 19, 1944.
• I got that done in Edinburgh, Scotland, 1944.
• It was mailed November 27th, 1944.
• Chedworth postmark, 14th January, 1944.
• D-Day, it's deployment at Normandy, June 6th, 1944.
• Unable to pay off his loan, Jacob K. was targeted for assassination on the night of December 18th, 1944.
• March 14, 1944. Red Army had intercepted an echelon: the Germans where taking people to a death camp in Azarichi, near Polesskoye swarm...
• Something that happened at Riga docks... ...on October 11, 1944.
• Something impossible just took place on this plane.
• The arraignment tooK place on Friday around lunchtime.
• Another meeting took place on 28 November 2003.
• Another meeting took place on 2 February 2004.
• International Day against Child Soldiers took place on 12 February.

Some examples from the web:

• On June 6, 1944, the day that will come to be known as D-Day finally arrives.
• But as soon as the invasion took place, he rushed to be with his men.
• The incident took place on June the 9th, 2007.
• There was an accident on June 6, 1995.
• There was an accident on June 6, 1995.
• These murders took place on June 9, 1912, in Villisca, Iowa.
• Sampson Brush Company regional manager filed a theft report on June 9 alleging Roy checked out company property on June 6, then took off with money collected from customers.
• Hitler moved into Hungary on March 19, 1944.
• I got that done in Edinburgh, Scotland, 1944.
• It was mailed November 27th, 1944.
• Chedworth postmark, 14th January, 1944.
• According to this, the actual Battle of Olustee took place on February 20, 1864.
• That concert took place on Friday 3rd September, the same weekend your car was in for its annual service.
• My Lord, the conversation took place on the prison wing, over a card game.
• A meeting between the Commission, the French authorities and Bull took place on 10 September 2004.
• As I rejected Microsoft's request for a postponement, the oral hearing took place on 30 and 31 March 2006.
• The fight against terrorism has also been a priority of the newly-established EU-India security dialogue, the first round of which took place on 22 May 2006 in Delhi.
• It took place on 2 February 2006 with Mr Carlos Franco, the director of the Presidency human rights programme.
• Moreover, the last round of the EU-China human rights dialogue took place on 16 June 2011.
• Thereafter, the Council adopted its common position, on 11 December 2006: the Parliament's second reading took place on 25 April 2007.