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I am working on an already existing site that has content.

There is a content type with field date and time. I need to remove the time component and just be Date only without deleting any content along the way. If the time data is lost, that is fine.

Can I simply delete the field and recreate it with date only? Or will that delete the existing data?

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  • will that delete the existing data? yep, any time you delete a field, all the data is deleted as well.
    – No Sssweat
    Oct 21, 2020 at 6:17
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    This maybe can be done with config. Export current config, change as desired, reimport. Otherwise create another field, migrate the data, then delete the old field.
    – leymannx
    Oct 21, 2020 at 6:36

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Unfortunately, as suggested, programmatically changing the config won't work, as all dates will show empty. Which explains why it's locked in the UI.

You'll need to browse your DB and find the node__{field_date} table and manually remove the time part for all values.

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Then make a sql export of this table.

Repeat the above with node_revision__{field_date}.

In Drupal, manage fields, delete your field_date. Recreate field_date with Date only. Import your sql db table exports you had made.

Flush cache in Drupal.

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