ToolGee LogoToolGee

Timezone Converter

Configure your base timezone and work range on the left, then add multiple target cities on the right to see their current local time, time difference and converted work hours at a glance.

Base Settings

:
:

Set your work or ad time range in the base timezone. Each city card on the right will show the corresponding local range and whether it crosses days.

Target Timezone Board

Usage Instructions

1. Set the base timezone

  • Choose your base timezone on the left. By default, the browser timezone will be used as a suggestion.
  • The base timezone card shows the current time and date in real time to compare with target cities.
  • When you turn on the work/ad time range, enter start/end time with dates. This range will be used as reference when converting to other cities.

2. Manage target cities

  • Use the dropdown in the top-right of the board to search by city or country, then add it as a target card.
  • Each target card shows local current time, date, time difference relative to the base timezone, and whether it is within 09:00–18:00 local business hours.
  • You can remove timezones at any time, or click \"Set as base\" to promote one city as the new base.

3. Read converted time ranges

  • When the work range is enabled on the left, each target card displays a \"Converted time range\" using local start/end times and dates.
  • If the conversion crosses calendar days (for example, late evening in base timezone equals next-day morning locally), a \"+1 day\" or \"-1 day\" label is added after the time.
  • This is useful for planning cross-timezone meetings, live events and ad windows where multiple regions need to be aligned.

4. What happens when you set a new base

  • Click \"Set as base\" on any target card to make that city the new base. The old base will be added back to the board as a target city.
  • If a work range is configured, it will be automatically converted to the new base timezone to keep the meaning of the time window consistent.

FAQ

Q: Why is the offset sometimes 8 hours and sometimes 7 hours for the same city?

A: This is caused by daylight saving time. The tool relies on the browser's built-in Intl timezone data and automatically handles DST based on date, no manual adjustment needed.

Q: Why do I see "+1 day" or "-1 day" next to the time?

A: When the converted local date is different from the card's current date (for example, base is 23:00 and the target city is already next morning), the tool marks it with "+1 day" or "-1 day" to avoid confusion.

Q: Will my browser/system timezone affect the results?

A: No. All calculations are based on the IANA timezone you select in the dropdown. The browser timezone is only used to suggest a default base timezone.