Fuso Horário
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
hora_destino = (origem + Δ) mod 24
About this calculator
The time zone calculator converts a time from location A to the corresponding time in location B, considering their offsets from UTC (Coordinated Universal Time). Simply enter the time in HH:MM (24h) format for city A, the UTC offset of A, and the UTC offset of B. The result is displayed in the same format, respecting the 24-hour cycle.
The calculation uses the formula: time_B = (time_A + (UTC_B − UTC_A)) modulo 24. For example, if in A (UTC-3) it is 14:00 and B is at UTC+2, the difference is +5 hours, resulting in 19:00 in B. If the sum exceeds 23:59, modulo 24 automatically adjusts to the next day (e.g., 22:00 + 4h = 02:00).
This tool is useful for planning international meetings, video calls, travel, or communications with people in different time zones. It also helps avoid common mistakes, such as forgetting daylight saving time (DST), note that the calculator does not automatically account for seasonal adjustments; you must enter the correct UTC offset with or without DST.
Important precautions: always verify that the UTC offsets are up-to-date, as some countries change their offsets (e.g., DST changes). The calculator assumes both locations are on the same day; for conversions crossing the International Date Line, the result may not be accurate. Use responsibly and confirm critical times with official sources.
Frequently asked questions
How do I convert a time that is in AM/PM format?
Convert the time to 24-hour format before using the calculator. For example, 2:00 PM equals 14:00.
Does the calculator consider daylight saving time?
No. You must manually adjust the UTC offset to include or exclude DST. For example, if a location uses UTC-3 in winter and UTC-2 in summer, enter the appropriate value.
What does 'modulo 24' mean in the formula?
It means the result is divided by 24 and the remainder is used as the hour. This ensures that times after 23:59 are adjusted to the next day (e.g., 25:00 becomes 01:00).
Can I use the calculator to plan a trip?
Yes, but note that it only converts times. For flight planning, also consider flight duration and possible date changes when crossing the International Date Line.
What is the difference between UTC and GMT?
In practice, UTC and GMT are equivalent for time zone conversions. UTC is the scientific standard, while GMT is a time zone. Both have the same reference value.