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Is it possible change the date format to day/month/year?
If not possible, can I make a trick to my subscribers write in dd/mm/yyyy and the form send to Sendy in mm/dd/yyyy? Because in my count the default data format is dd/mm/yyyy.
Can I use a date picker for do that?
Are you using a 'Date' based custom field? The date passed into this field can be written in any format.