Riyadh to London Time Converter

Yes. Every conversion uses the rules for the date you pick, so a time in July uses summer time in London and New York, and a time in January uses winter time. The difference between two places can change for a week or two each spring and autumn, because the US, Europe, and Australia change their clocks on different dates.

Not quite. EST is Eastern Standard Time, UTC−5, used in winter. In summer the US East Coast uses EDT, UTC−4. Most people write “EST” all year to mean whatever the New York clock shows, so this converter treats EST, CST, MST and PST that way. For a fixed offset all year, convert from UTC instead.

For everyday use, none: both are the time at 0° longitude with no daylight saving. UTC is the scientific standard kept by atomic clocks; GMT is the older name, still used in the UK and Ireland. Note that UK clocks show BST (UTC+1) in summer, so “London time” and “GMT” differ from late March to late October.

India (IST, UTC+5:30) is 9 hours 30 minutes ahead of New York in winter and 10 hours 30 minutes ahead in summer, and 12 hours 30 minutes or 13 hours 30 minutes ahead of Los Angeles. India has no daylight saving, so the gap changes when US clocks do.

Add every city to the world clock and look at the meeting planner. Green hours fall between 9 AM and 5 PM in all of them. If no hour is green for everyone, as with New York and Sydney, pick a yellow hour, which is early morning or evening for someone, and rotate it between teams.

Some countries set their clocks to the middle of their land rather than a whole hour from UTC. India is UTC+5:30, Iran +3:30, Afghanistan +4:30, Nepal +5:45, and parts of Australia +9:30. The converter shows these to the minute.