The base time zone is known as Coordinated Universal Time (UTC). It runs parallel to the Greenwich Mean Time, with just a few seconds difference.
New Delhi is in time zone UTC +05:30. (i.e. the Indian Standard Time-IST)
This means that when it is 12 noon in UTC it is 5:30 pm in New Delhi.
Paris is in the time zone UTC +01:00 (i.e. the Central European Time Zone)
Thus Paris is 4 hours and 30 minutes behind New Delhi.