Hi Attig,
Thank you for using our Syncfusion products.
SfDatePicker control will not allow us to have 24 hr time format. We have to use SfTimePicker to perform time related operations. In SfTimePicker, we don't have support to set 24 hr time format. We have logged this as a feature request in our database; we will implement this feature in any of our upcoming releases.
Please let us know if you have any queries.
Regards,
Swasthika Lakshmi I