Following a rain threat in Melbourne, the International Cricket Council (ICC) made significant changes to the playing conditions for the England vs. Pakistan T20 World Cup final.

Keeping all of these factors in mind, the ICC has decided to increase the reserve day playing time from two hours to fours. The Event Technical Committee (ETC) has increased the provision of additional playing time on the reserve day from two hours to four hours (clause 13.7.3 of the Playing Conditions), in case more time is required to complete the match and obtain a result, the ICC said in a statement.
If necessary, play on the reserve day can begin at 9:30 IST to complete the final. Because ICC knockouts require a minimum of 10 overs per side rather than the usual five, the extra time has been added. It should be noted that the reserve day will be used only if the minimum overs cannot be completed on Sunday.
The match officials will do everything possible to get a result on Sunday, even if it means playing a 10-overs-a-side match. If the weather does not cooperate, the match will resume on Monday from where it was left on Sunday.source: BBN SportsIt should be noted that a match in the knockout stage requires 10 overs per side, and every effort will be made to complete the match on the scheduled match day, with any necessary overs reductions taking place.
Only if the minimum number of overs required for a match cannot be bowled on Sunday will the match be moved to the reserve day. The reserve day will begin at 1500h (9:30 AM IST) and will be a continuation of the scheduled match day’s play According to the ICC.