Working hours for Japan, Europe and the US East plotted on a single India-time day, with the India shifts underneath. Offsets come from the browser's time zone database, so daylight saving is applied per region on whichever date you're looking at.
The solid red line is now. The dashed red line is the time you enter.
Local clock times in each region.
Start time is IST; length is in hours. Shifts running past midnight wrap to the start of the row.