Time Zone Converter

How to compare time zones without DST mistakes

Time-zone conversion is more reliable when it uses named regions such as America/Chicago or Europe/London instead of a fixed offset such as UTC−6. Regional zones can apply daylight-saving rules for the selected date, while a fixed offset never changes.

The same two cities may be separated by different numbers of hours at different times of year because countries change clocks on different dates—or do not observe daylight saving at all. Always choose the actual meeting date before relying on the difference.

A daylight-saving example

A meeting at 9:00 a.m. in New York does not always convert to the same London time throughout the year. For short periods in spring and autumn, their daylight-saving transitions are out of alignment.

Schedule across dates carefully

A converted time can fall on the previous or next calendar day. This is especially common across the International Date Line or between North America and Asia-Pacific locations. Include the weekday and full date in invitations instead of communicating only the clock time.

For travel, remember that an itinerary usually prints departures and arrivals in the local time of each airport. Duration cannot be calculated by simply subtracting the displayed times unless both are first converted to a common zone.

Best practices for remote meetings

• Select the date first so daylight-saving rules are applied.
• Use a named city or IANA zone rather than an ambiguous abbreviation.
• Share the zone, date and time together.
• Send a calendar invitation so each device can display local time.

International planning example

Suppose a team member proposes “Friday at 4.” Ask for the city or named time zone before converting, then confirm whether the converted time falls on Friday for every participant. For recurring meetings, check several future dates because a daylight-saving change may shift the local hour later in the series. Calendar software normally adjusts named zones, but a manually entered fixed-UTC event may not. When a deadline matters, include a UTC reference and an exact date in addition to the local time.

Review the final invitation from the recipient’s perspective: local date, local hour, zone and meeting duration should all be unambiguous.

Frequently asked questions

Does this account for daylight saving? Named browser time zones apply rules for the selected date.

Why is CST confusing? Abbreviations can describe different regions, and standard time may not be active in summer.

Can conversion change the day? Yes. Check the displayed date as well as the hour.