Changing dates across many lines of transactions can be tiresome. To ensure that this process is fast and accurate, you should use the DATE formula.
=DATE ( year , month , day )
Using this format you can use certain parts of the date that has been extracted from the bank statements, quickly replacing, for example, the year, with 2014. To achieve this example, use the following format, replacing XXX with a cell reference to the extracted date:
=DATE ( 2014 , month(XXX) , day(XXX) )