Improve accuracy in dates
When one enters two dates in a column, for instance:
12/01/2019 00:00 ==> General format (43800)
12/01/2019 00:30 ==> General format (43800.02083)
And wants to extend the dates for many months, Excel loses accuracy and produces wrong minutes, because the general format of the date has only a few decimal places. In order to get the correct date and time, one must edit and change 43800.02083 to 43800.02083333333333333333333. After that, the minutes come out correctly.