Convert date and time between world capitals — Brasília, London, Tokyo, Washington, Lisbon and 130+ cities — with daylight-saving rules. Free online.
A time zone is the difference in clock time between regions of the planet relative to Coordinated Universal Time (UTC). Each country adopts one or more time zones based on its territory, and most national capitals follow an official time zone identified by a standard IANA name (such as America/Sao_Paulo, Europe/London, or Asia/Tokyo). These identifiers carry not only the offset from UTC but also the daylight-saving time (DST) rules in force in each place. Daylight saving makes a capital's offset change over the year — for example, London sits at UTC+0 in winter and UTC+1 in summer. Because of this, the time difference between two capitals can vary depending on the date you choose, and in some cases the calendar changes too: when it is Tuesday night in Tokyo, it is still Tuesday morning in Brasília, but it may be Monday night in Los Angeles. This converter lets you pick a date and time, select the origin capital and the destination capital from over 130 cities worldwide, and instantly see the local time at the destination, the difference in hours (and minutes, when applicable), and the day-change indication. Calculations use the IANA time zone database built into your browser, which reflects current offsets and daylight-saving rules. For critical decisions (flights, international meetings, legal deadlines), always confirm the time with the official source.
Enter the date and time in the origin field, select the origin capital and the destination capital. The result shows the local date and time at the destination, the difference in hours, and whether the day changed.
Yes. Because daylight saving shifts the UTC offset of many capitals over the year, the difference between two cities can change on certain dates. That is why the converter asks for a specific date.
Yes. We use the browser IANA time zone database, which automatically applies each capital current daylight-saving rules.
When the time difference pushes the destination clock past midnight (forward or backward) relative to the origin, the destination calendar is one day ahead or behind. The converter shows "Next day" or "Previous day".
Over 130 national capitals across every continent, with Portuguese and English names and each one IANA time zone.
Yes, completely free, with no registration and no usage limit.