Yes, I know; this question has been asked thousands of times in hundreds of different places, but Google Sheets stubbornly refuses to let me convert a date such as "9/18/2004" to "2004-9-18". I select one or more cells whose date format is "dd/mm/yyyy", click on FORMAT, then NUMBER, then MORE FORMATS, then I select "More date and time formats", and then select the example "1930-08-05", and then nothing happens. Nothing changes. I need help with this. Here is a link to the problem column: https://docs.google.com/spreadsheets/d/1gYdPcNO-Jq1SFUpdb88o7KKVqG5_ia9NpD_3T98CkEw/edit?usp=sharing
Thanks.
