Bucharest is 3.5 hours behind Delhi
Best overlap: 12:00 PM to 6:00 PM in Delhi is 8:30 AM to 2:30 PM in Bucharest.
Target 12:00 PM to 6:00 PM in Delhi, which lands at 8:30 AM to 2:30 PM for the Bucharest side. The overlap is wide at 6 hours, so you can protect mornings for deep work and still find plenty of meeting time. Daylight saving complicates things slightly: Bucharest observes it, Delhi doesn't, so the difference flexes by an hour part of the year.