Conversão fuso horário
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The time zone converter calculates time differences between locations using the formula h_dest = h_orig + (tz_dest − tz_orig), where tz_dest and tz_orig are the time zone offsets from GMT/UTC. It's ideal for international travel planning, virtual meetings, or synchronizing events across regions.
To use, input the original time and select the source and target time zones. The tool adjusts automatically for positive (ahead of GMT) or negative (behind GMT) offsets. Example: If it's 3 PM in London (GMT+0) and São Paulo (GMT−3), the calculation becomes 15 + (−3 − 0) = 12 PM.
Note: Daylight Saving Time adjustments are not included automatically. If locations have seasonal deviations, apply corrections manually. Time zones with fractional offsets (e.g., GMT+5:30) may require additional steps. Always verify current time zones, as some countries change their offsets periodically.
This tool is useful for flight connections, live streams, or global collaboration. For extended periods, cross-check with a calendar that includes Daylight Saving Time or use tools that integrate real-time zone data.
Frequently asked questions
Does the converter account for Daylight Saving Time automatically?
No. Daylight Saving adjustments are not included. You must manually correct offsets if locations observe it.
How does it work for time zones west of the Prime Meridian?
West zones (e.g., GMT-5) use negative offsets. The formula subtracts the value from the source time. Example: 10 AM in New York (GMT-4) to London (GMT+0) = 10 + (0 - (-4)) = 2 PM.
Can I convert multiple time zones at once?
No. The tool calculates one conversion at a time. Repeat the process for each zone pair.
How to handle fractional time zone offsets?
Use decimal values. For example, GMT+5:30 becomes +5.5 hours. The formula works with decimal values.