World Clock & Time Zone Offset Solver

Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer months so that evening daylight lasts longer. Most countries in North America and Europe observe DST, though start and end dates vary: the US switches on the second Sunday of March and the first Sunday of November; the EU transitions on the last Sunday of March and October.

Countries near the equator, such as Pakistan, India, and most of Africa and Southeast Asia, do not observe DST because the variation in daylight hours between seasons is minimal. This means that during DST periods, the offset between a DST-observing and non-observing country changes by one hour.

When converting times across zones, failing to account for DST is a common source of error. A UTC-based converter eliminates this complexity: convert the source time to UTC first, then convert UTC to the destination time zone, applying the correct DST-adjusted offset for that specific date.

The most reliable method for time zone conversion involves UTC as an intermediary. Step 1: Determine the UTC offset of the source time zone on the given date (accounting for DST). Step 2: Convert the local time to UTC by subtracting the source offset. Step 3: Determine the UTC offset of the destination time zone on the same date. Step 4: Add the destination offset to UTC to get the local time.

Example: Converting 9:00 AM EST (UTC-5) to PKT (Pakistan Standard Time, UTC+5). UTC time = 9:00 AM - (-5) = 2:00 PM UTC. PKT time = 2:00 PM UTC + 5 = 7:00 PM PKT.

When a conversion crosses midnight, the date must advance or regress accordingly. For example, 11:00 PM UTC+2 converts to 3:00 AM the next day in UTC+4.

Enter the source date and time, then select the source time zone and the destination time zone from the dropdown lists. The converted local time, destination date, and offset difference update instantly.

The Dual Clock Dial preview renders analog clock faces for both time zones side by side, which is a quick visual sanity check when scheduling a call across a large time difference.

This converter is part of a Date Time Tools cluster. To calculate elapsed time between two exact timestamps, use the Time Duration Calculator. For solar sunrise and sunset times by location, see the Solar Noon Daylight Calculator.