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On a drupal site we added the date/time field.
First we needed only the day, month , year notation.
Now we also need the hours and minutes. But there is already some data in the table.
Now you can’t change the field settings.
What’s a good solution, where we don’t lose the already existing data?
I solved by doing the following.
Export the table ….._startdate.
Make that same table empty
Change the fieldsetting to the right format.
Import the exported data back into table ….._startdate.
And it works perfectly. 🙂