On what specific date (dd/mm/yy) was the computer invented?

A lot of computing machines were being used for computing activities. Some of the early known recorded facts are:

Pascal's mechanical calculating machine in 1642.

Gotfried Willhelm Leibnitz's calculating Machine in1672.

Charle's Babbage's Universal Electronic Calulator in1812.

Charle's Babbage's analytic Engine/Automatic calculator in 1832.

H Holebrith 's  Computer (Tabulating Machinery) in 1889.

A series of inventions of electronic components and the digital algebra has contributed  to the computing history during the 20th century.The increase in the speed of processing , the amount of memory and the storage capacity  besides making it more portable have become the main issues now.