The text above is a summary, you can read full article here

Here’s What To Know About Changing A Flight Date After Booking It
Sometimes it is pretty different to request a flight date change post it's booking on any airline. However, the difficulty of such a situation can depend upon the airline’s travel policies, and the time of date change request is made. Besides, one can make changes in the date, time, and destination on flight tickets while they are booing it. But making any physical changes to the flight date is just not allowed on any airline, why? Well, airlines usually reissue a fresh ticket after the original ticket is canceled.
Also, passengers might need to pay the date change fee to their respective airlines. This helps them to travel better on their new itinerary. Moreover, read further to know more about Can we change flight date after booking.