You can change the date & time format in Google Sheets & Excel Online using this guide. Use different date & time formats in spreadsheets.

Excel is a powerful software that can do more advanced tasks than you may imagine. You can get Excel to automatically update the date in your Excel document each time you open it. Learning how to ...

How to return a sequence of dates in Excel Excel’s fill handle can generate a quick list of dates for you, but the list is static; you must create a new list if your needs change.