Islamabad is 4 hours ahead of Barcelona
Best overlap: 8:00 AM to 2:00 PM in Barcelona is 12:00 PM to 6:00 PM in Islamabad.
Shoot for 8:00 AM to 2:00 PM in Barcelona; your Islamabad colleagues will see that as 12:00 PM to 6:00 PM. Islamabad is 4 hours ahead of Barcelona, but with 6 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours. Seasonal note: Barcelona uses daylight saving and Islamabad doesn't, so double-check the times in your own months — they can move by an hour.