All times are listed in GMT (Greenwich Mean Time). The signal has a ‘Signal Time’ on it and you should enter the trade as soon as possible within the ‘5 minute window’ based on 5 minutes from the time on that ‘Signal Time’.
If you cannot enter the trade within that ‘5 minute window’ then you should skip that trade and wait for the next signal.
Most broker platforms use GMT and that is the only relevant time for using the Expiry time, which is always 45 to 60 minutes from the Signal Time on the signal alert.
You should use the exact Expiry time listed on the signal alert for your trade.
If you want to convert GMT to your local time, you can do that through the link below.