Question: how to change date from dd/mm/yyyy to yyyy/mm/dd?
Answer: There is a formula that can quickly convert dd/mm/yyyy to mm/dd/yyyy date format. Select a blank cell next to the dates you want to convert, type this formula =DATE(VALUE(RIGHT(A9,4)), VALUE(MID(A9,4,2)), VALUE(LEFT(A9,2))), and drag fill handle over the cells which need to use this formula.