'Disable datetimepicker shortcut keyboard input

I use a readonly atribute in input field when new record is inserted.

<input type="text" name="recordtime" id="recordtime" class="form-control" autocomplete="off"  readonly="readonly" />

The date that filled is the last record in DB + 1 day.

I recently discover that I if click on the input field and hit t on the keyboard, the current date is inserted. How to turn it off?

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