Time Zone Converter — Convert Time Between Any Two Time Zones
For businesses in America's Heartland, collaborating with teams in Kolkata, Mumbai, or Bangalore requires finding the sweet spot where the US workday starts and India's evening winds down. A call at 8:00 AM Central Time matches 7:30 PM IST in winter (or 6:30 PM IST in summer), making the early morning US window the most productive for collaborative handovers. This converter eliminates manual math and keeps both teams aligned.
Frequently Asked Questions — Time Zone Converter
Enter the time you want to convert in the "Time in Source Zone" field, select your source time zone from the first dropdown (it auto-detects your local zone by default), then choose your target time zone from the second dropdown and click Convert. The result shows the equivalent time in your target zone, fully accounting for the UTC offset difference and any applicable Daylight Saving Time rules.
Yes, completely automatically. The converter uses the Intl.DateTimeFormat API with the full IANA timezone database, which contains all historical and current Daylight Saving Time rules for every country and region. Whether you are converting a time in summer (when many regions observe DST) or winter (when most regions revert to standard time), the correct offset is applied without any manual input from you.
All 400+ time zones in the IANA (Internet Assigned Numbers Authority) timezone database are available. This includes every country, territory, and historical time zone on Earth — from America/New_York and Europe/London to Asia/Kolkata, Pacific/Auckland, and even unusual zones like Asia/Kathmandu (UTC+5:45) and Asia/Kolkata (UTC+5:30). Simply search or scroll through the dropdown to find your zone.
Use the converter to check what your proposed meeting time looks like in each participant's time zone. For example, if you want to schedule at 10:00 AM New York time, convert it to London (typically 3:00 PM GMT) and Mumbai (typically 8:30 PM IST) to check if those times are reasonable working hours. For a visual overview of multiple cities simultaneously, use the World Clock tool to see all times side by side.
UTC (Coordinated Universal Time) is the global time standard with no offset — it is the baseline from which all other time zones are measured. GMT (Greenwich Mean Time) is historically the same as UTC and used interchangeably in everyday language. Standard time zones like EST (Eastern Standard Time) or IST (Indian Standard Time) are defined by their fixed offset from UTC — for example, IST is UTC+5:30. The IANA database used by this converter uses named zones (like Asia/Kolkata) rather than abbreviations, because abbreviations like "CST" can refer to multiple different zones worldwide.