420 World Clock logo: a globe clock on a marijuana leaf

The Official 420 API

420 World Clock

It's 4:20 somewhere. Here's where:

Your local time

Time until next 4:20: --

Next up: …

Closest

World map coloured by how close each time zone is to 4:20. Hover or tap a zone for its local time · scroll to zoom, drag to moveTap a zone for its time · pinch to zoom

Drag to turn · scroll or +/− to zoom · click a zone for its time and lawSwipe sideways to turn · pinch to zoom · tap a zone

Next 4:20s

    Just passed

      Queue

      World clocks

      Card colours: green = 4:20 now or within 10 min · gold = within 1 h · sand = within 2 h · teal = within 4 h · blue = later

      Time from 4:20

      Before or after, morning or afternoon · shaded side = night

      Law

      • ✓ Legal
      • ◐ Decriminalized
      • ⚕ Medical only
      • ⊘ Illegal
      • ☠️ Death sentences given

      Tap a symbol on the map for details

      4:20 now and in the next 6 hours

      Soonest first. More places join the list as their 4:20 comes around.

      Law: ✓ legal · ◐ decriminalized · ⚕ medical only · ⊘ illegal · ☠️ death sentences given · ? = best guess, thin sources · tap any name for its card

      4:20 now and within 3 hours

      FlagLocal lawWhereLocal timeTimeFrom 4:20To 4:20

      In 3 to 6 hours

      FlagLocal lawWhereLocal timeTimeFrom 4:20To 4:20

      How time zones work

      Nobody runs the world's clocks. Each country sets its own by law, scientists keep one master clock, and a volunteer database carries every rule to your phone.

      1 · Countries decide

      • Each government sets its own time by law: which offset, and whether clocks change in summer.
      • In the US, Congress sets the zones and the Department of Transportation draws the lines; states may opt out of daylight saving (Arizona and Hawaii do).
      • Geography doesn't decide: China uses one zone, UTC+8, across a country five zones wide. France has twelve, counting its overseas territories, the most of any country.
      • Rules change often: Mexico dropped most daylight saving in 2022; Kazakhstan moved to a single zone in 2024.

      2 · One master clock

      • UTC (Coordinated Universal Time, also called Zulu) is the reference every zone is measured from.
      • It is computed near Paris by the BIPM from hundreds of atomic clocks around the world. Greenwich became the zero line at a conference in Washington in 1884.
      • The US keeps official time at NIST and the US Naval Observatory; this page checks its clock against the Naval Observatory's.
      • Offsets run from UTC−12 to UTC+14, and not all are whole hours: India is +5:30, Nepal +5:45, New Zealand's Chatham Islands +12:45.

      3 · How your phone knows

      • Every rule from every government is recorded in the tz database, kept by volunteers and published by IANA, the body that also runs internet domain and address registries.
      • It names zones by city (America/New_York, Asia/Kolkata) and records every change since 1970.
      • New releases come out several times a year, whenever a country changes its rules. Your phone, computer and browser all carry a copy.

      4 · How this page fits together

      • Your browser works out every local time from its copy of the tz database. Nothing about the time is guessed.
      • The map draws zone borders from timezone-boundary-builder, which traces them from OpenStreetMap. Areas that keep the same clock are merged.
      • 4:20 comes twice a day, morning and afternoon, so no place is ever more than six hours from one.
      • Developers: the same answers come from the free 420 API.