Hello ,  i have noticed that the deadline for the jam in itch is 25th but on indie connect website it is has been mentioned has 26th , so which one is the actual game jam deadline ?

The deadline is 25th EOD.  

( Here on itch it was entered as 25th at 11:59 PM, while on Indieconnect  it was entered as 26th at 12:00 AM or 26th at 00:00)