BST - British Summer Time Time zones difference, time zone converter
BST is UTC+1 Hours. British Summer Time is 1 hour ahead of Coordinated Universal Time (UTC). BST timezone is observed in Europe. Therefore, to find the current time in this time zone one has to add 1 hour to the present time in Coordinate Universal Time.
BST is -4.5 hour behind to Indian Standard Time-IST the local time zone and hence to convert the IST to CET subtract 4.5 hours from Indian Standard Time.