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There is dates are off by one day if I compare the dates of departure(from etickets which I have filled on the form) but we the passport has date of arrival at the destination(due to journey time).

How would ukba verify given if applicants doesn't send them the tickets, only the passport!!

Do we gave to explain at the last page of the form.??

Don't worry how the HO do their job. Just write the actual dates. There are other ways to find out your travel dates (passengers list on flights for example). The HO are aware that flights can cross the date. Also some nationals (EU citizens for example) normally don't get stamped at all but they can still apply for BC.