Time zone converterTime zones, in sync.

How the grid works

Each row is a time zone and each column is the same instant, so the numbers you read down a column are one moment of the day worn by different clocks. The color scale runs from dark midnight to golden noon and back, so you can spot daytime and nighttime across cities at a glance. It is a visual clock cycle, not a forecast of local sunrise or sunset. Your own zone comes first, read from the browser, and the Zulu row stays on the board because UTC is the reference everything else is measured against.

Add cities by name, country, zone abbreviation or IANA id. Use each city’s menu to reorder them or mark any row as home - the grid re-anchors on its day and the other rows show their offset against it. Tapping an hour selects a one-hour slot across every row, and dragging its edges stretches it in whole-hour steps. Once a slot is picked, each row shows its own local start and end time, with a date under each endpoint so overnight meetings stay clear. The action bar copies the times as text, downloads an iCal file for Outlook and Apple Calendar, or opens a prefilled Google Calendar event. You can also focus either selection edge and use the arrow keys to adjust the range without dragging. The date strip switches between the next seven days, with weekends set apart.

The set of rows and the selected slot are saved in your browser and mirrored into the page address, so copying the URL from the address bar hands the exact same board to a colleague. Daylight saving needs no attention here: every cell is computed from the zone database, on transition days the skipped or repeated hour simply shows up in the row.

If one of the sides is written with a Z on the end, the dedicated pages go deeper: the Zulu time converter renders one Zulu time in every common format, and the Zulu pair pages cover single zones like Zulu to EST or Zulu to CET with full hour charts and the daylight saving rules. The four-digit notation itself is explained on the military time converter. Just want the current time in a set of cities, with no meeting to plan? The same grid lives on the world clock page.