There is no July contract ready in the exchange, so it will not be available in the kite instrument csv dump file as well. for more deatils you can go through csv file: Here
The question is not about the availability of instruments. It is about the contract naming convention.
If the June contract name is BANKNIFTY24J1651000PE, will the July contract name also be BANKNIFTY24J1651000PE? Because the month is denoted by just one letter, this question also applies to the March and May contract names.
The normal naming convention is not like BANKNIFTY24J1651000PE; it is like BANKNIFTY2471651000PE and BANKNIFTY25MAR48000PE but from October onwards they changed to the month first letter instead of the month number. For March, it is like BANKNIFTY25MAR48000PE because March has only monthly expiry available; when it comes to weekly expiry, the month denote will be changed as above.
this question also applies to the March and May contract names.
Can't confirm this because data is not available for May.
for more deatils you can go through csv file: Here
If the June contract name is BANKNIFTY24J1651000PE, will the July contract name also be BANKNIFTY24J1651000PE? Because the month is denoted by just one letter, this question also applies to the March and May contract names.
These are weekly contracts.