Do i need to provide exact date of arrival?
No, you don’t need to provide exact date of arrival but your arrival should be on the date of entry stated on the visa approval or after that date. However, please note that you must exit the country before the expiry date stated on the approval letter.
The approval letter can not be amended once it is issued, so in case you wish to arrive earlier than the date stated on the approval letter. You are required to apply for a new letter of approval to update the date of arrival.