# Perfect Clock

> Perfect Clock is a free world clock that shows your calendar events on side-by-side timelines of your cities, so every meeting lines up with the local time in each time zone. It runs in the browser at perfectclock.cc and as a Chrome side panel and Firefox sidebar extension. No account, no ads; data stays in the browser.

Perfect Clock is for people whose day spans several time zones: remote teams, freelancers with clients abroad, managers and recruiters booking international calls, travelers and digital nomads, traders and sports fans.

Key facts:

- Free: up to 3 cities, Google Calendar connection and event notifications.
- Google Calendar with read-only access; events go straight from Google to the browser, with no Perfect Clock server in between.
- Working hours per city are highlighted on its timeline, to find a meeting time that suits everyone.
- Time zones and daylight saving time changes are handled automatically.
- Browser notification when an event starts.
- Keyboard shortcuts: previous/next day, week or event, jump to now.
- 12h or 24h time and six date formats.

## App

- [Perfect Clock web app](https://perfectclock.cc/): world clock timelines with your calendar, nothing to install
- [Perfect Clock Chrome extension](https://chromewebstore.google.com/detail/perfect-clock/oecbfdgpeigoogoehhkffgpnmiepeefe): the same app in Chrome's side panel
- [Perfect Clock Firefox add-on](https://addons.mozilla.org/firefox/addon/perfect-clock/): the same app in Firefox's sidebar
- [About Perfect Clock](https://perfectclock.cc/about.html): features, how it works, who it's for, FAQ
- [Perfect Clock for ChatGPT and Claude](https://perfectclock.cc/ai): plan meetings across time zones from a conversation; remote MCP server at https://perfectclock.cc/mcp (tools plan_meeting_schedule, find_meeting_windows; no auth)

## Public calendars

Curated calendars that open in Perfect Clock with event times converted to your time zone. Free, no sign-up.

- [Stock Market Hours Today: NYSE, Shanghai, Tokyo](https://perfectclock.cc/big-four-stock-exchanges): Is the stock market open today? NYSE, NASDAQ, Shanghai and Tokyo hours in your time zone, with pre-market, after-hours, holidays and early closes.
- [Rocket Launch Schedule Today: SpaceX & Rocket Lab](https://perfectclock.cc/rocket-launches): Rocket launches today and upcoming: SpaceX, Rocket Lab, NASA, ISRO and JAXA launch times in your time zone, from Cape Canaveral, Vandenberg and beyond.
- [Cape Canaveral Launch Schedule: Florida Launches](https://perfectclock.cc/cape-canaveral-launches): Cape Canaveral launch schedule: upcoming rocket launches from Cape Canaveral and Kennedy Space Center in Florida, with launch times in your time zone.
- [Vandenberg Launch Schedule: Rocket Launches Today](https://perfectclock.cc/vandenberg-launches): Vandenberg launch schedule: upcoming SpaceX Falcon 9 and other rocket launches from California, with launch times in your time zone and Polymarket odds.
- [SpaceX Launch Schedule: Falcon 9 Launches Today](https://perfectclock.cc/spacex-launches): SpaceX launch schedule: upcoming Falcon 9, Falcon Heavy and Starship launches from Florida and California, launch times in your time zone, Polymarket odds.
- [Rocket Lab Launch Schedule: Electron Launches](https://perfectclock.cc/rocket-lab-launches): Rocket Lab launch schedule: upcoming Electron launches from New Zealand and Virginia, with launch times in your time zone and Polymarket odds where they exist.
- [F1 Schedule 2026: Race Times in Your Time Zone](https://perfectclock.cc/f1-polymarket): The 2026 F1 schedule in your time zone: start times of every practice, sprint, qualifying and Grand Prix, with Polymarket odds on the winner and podium.
- [Forex Market Hours Today: London, New York, Tokyo](https://perfectclock.cc/forex): Is the forex market open? London, New York, Tokyo and Sydney sessions and their overlaps in your time zone, with this week's news and Polymarket odds.
- [Crypto Market Hours & Economic Calendar](https://perfectclock.cc/crypto): Crypto market hours: open 24/7, but moved by the US session, Bitcoin ETF flows, Fed and CPI with Polymarket odds and options expiries - in your time zone.
- [Champions League, UFC & Tennis Odds Calendar](https://perfectclock.cc/sports-polymarket): Champions League, Nations League, UFC cards, tennis finals and big boxing fights in your time zone, with Polymarket odds on every match - result, props and more.
- [NBA Schedule & Polymarket Odds in Your Time Zone](https://perfectclock.cc/nba-polymarket): Every NBA game of the season in your time zone, with Polymarket odds on the winner, spread and totals for the upcoming games. Updated daily.
- [NHL Schedule & Polymarket Odds in Your Time Zone](https://perfectclock.cc/nhl-polymarket): Every NHL game of the season in your time zone, with Polymarket odds on the winner, puck line and totals for the upcoming games. Updated daily.
- [World Series & MLB Schedule, TV & Odds](https://perfectclock.cc/mlb-polymarket): World Series and every MLB game in your time zone: first pitch, US TV and radio broadcasters, and Polymarket odds on the winner and totals. Updated daily.
- [NASCAR Race Times & Polymarket Odds](https://perfectclock.cc/nascar-polymarket): NASCAR Cup, O'Reilly and Truck Series races for the rest of the season in your time zone, with Polymarket odds on the race winner.
- [MotoGP Live Times: When to Watch Every Session](https://perfectclock.cc/motogp): When to watch MotoGP live: every practice, qualifying, sprint and race - plus Moto2 and Moto3 races - in your time zone, so you never miss a session.
- [Winter Sports Live TV Schedule in Your Time Zone](https://perfectclock.cc/winter-world-cup): When to watch skiing, biathlon, ski jumping, luge, bobsleigh and figure and speed skating live: World Cup and World Championship start times in your time zone.
- [Marathon, IRONMAN & Cycling Start Times to Watch Live](https://perfectclock.cc/endurance): When to tune in live: start times of the World Marathon Majors, the IRONMAN World Championship and cycling's classics, in your time zone.
- [BBC World Service Shortwave Frequencies & Times](https://perfectclock.cc/bbc-shortwave): BBC World Service shortwave schedule: English for Africa, Asia and the Middle East, Hausa, Somali, Arabic, Dari, Pashto, Korean, with frequencies.
- [Voice of America (VOA) Shortwave Frequencies](https://perfectclock.cc/voice-of-america-shortwave): VOA shortwave schedule and frequencies: Korean, Mandarin, Tibetan, Pashto, Dari and English broadcasts with target areas, converted to your time zone.
- [China Radio International Shortwave Schedule](https://perfectclock.cc/china-radio-international-shortwave): China Radio International shortwave schedule: English, Mandarin, Cantonese, Russian, Esperanto and 35+ more languages, with frequencies, in your time zone.
- [Radio Romania International Shortwave Schedule](https://perfectclock.cc/radio-romania-international-shortwave): Radio Romania International (RRI) shortwave schedule and frequencies: English, Romanian, French, German, Spanish, Russian and more, in your time zone.
- [NHK World Radio Japan Shortwave Schedule](https://perfectclock.cc/nhk-radio-japan-shortwave): NHK World Radio Japan shortwave schedule and frequencies: Japanese worldwide, Mandarin, Korean, Russian, English and Asian languages, in your time zone.
- [KBS World Radio Shortwave Schedule & Frequencies](https://perfectclock.cc/kbs-world-radio-shortwave): KBS World Radio shortwave schedule and frequencies: Korean, English, Japanese, Spanish, Russian and Mandarin from South Korea, converted to your time zone.
- [Radio Taiwan International Shortwave Schedule](https://perfectclock.cc/radio-taiwan-international-shortwave): Radio Taiwan International (RTI) shortwave schedule and frequencies: Mandarin, Hakka, Cantonese, German, French, Spanish, English and more, in your time zone.
- [Voice of Turkey Shortwave Schedule & Frequencies](https://perfectclock.cc/voice-of-turkey-shortwave): Voice of Turkey (TRT) shortwave schedule and frequencies: English, Turkish, Arabic, German, Farsi and Turkic languages of Central Asia, in your time zone.
- [Radio Havana Cuba Shortwave Frequencies](https://perfectclock.cc/radio-havana-cuba-shortwave): Radio Havana Cuba shortwave schedule and frequencies: Spanish, English, French, Creole and Portuguese for North and Latin America, in your time zone.
- [Voice of Korea Shortwave Schedule (North Korea)](https://perfectclock.cc/voice-of-korea-shortwave): Voice of Korea, North Korea's shortwave station: English, French, Spanish, Mandarin, Russian, Japanese and German, with frequencies, in your time zone.
- [Voice of Vietnam Shortwave Schedule & Frequencies](https://perfectclock.cc/voice-of-vietnam-shortwave): Voice of Vietnam (VOV) shortwave schedule and frequencies: English, French, Mandarin, Spanish, German, Russian and Asian languages, in your time zone.
- [Radio New Zealand Shortwave Schedule & Frequencies](https://perfectclock.cc/rnz-pacific-shortwave): Radio New Zealand (RNZ Pacific) shortwave schedule and frequencies: English around the clock for the Pacific islands, plus Pijin and French, in your time zone.
- [Vatican Radio Shortwave Frequencies & Schedule](https://perfectclock.cc/vatican-radio-shortwave): Vatican Radio (Radio Vaticana) shortwave schedule: Portuguese, Mandarin, Ukrainian, Russian, French and more, with frequencies, in your time zone.
- [All India Radio Shortwave Schedule & Frequencies](https://perfectclock.cc/all-india-radio-shortwave): All India Radio (AIR) External Services schedule and frequencies: Bengali, Urdu, Nepali, Tibetan, Dari, Pashto, Farsi, Arabic and more, in your time zone.
- [RFI Shortwave Frequencies & Schedule](https://perfectclock.cc/rfi-shortwave): Radio France Internationale (RFI) shortwave schedule and frequencies: French, Hausa, Fula, Mandenkan and Swahili for Africa, in your time zone.
- [Radio Exterior de España Shortwave Schedule](https://perfectclock.cc/radio-exterior-espana-shortwave): Radio Exterior de España (REE) shortwave schedule and frequencies: Spanish for the Americas and Africa, weekly Ladino, Arabic, English, French programs.
- [Radio Prague International Shortwave Schedule](https://perfectclock.cc/radio-prague-shortwave): Radio Prague International shortwave schedule and frequencies: English, French, Spanish and German for the Americas and Russian for Europe, in your time zone.
- [Radio Slovakia International Shortwave Schedule](https://perfectclock.cc/radio-slovakia-international-shortwave): Radio Slovakia International shortwave schedule and frequencies: English, Spanish, German, French, Russian and Slovak via relay stations, in your time zone.
- [Trans World Radio (TWR) Shortwave Schedule](https://perfectclock.cc/trans-world-radio-shortwave): Trans World Radio (TWR) shortwave and medium wave schedule: Christian programs in about 100 languages of Africa and Asia, with frequencies, in your time zone.
- [Adventist World Radio (AWR) Shortwave Schedule](https://perfectclock.cc/adventist-world-radio-shortwave): Adventist World Radio (AWR) shortwave schedule and frequencies: Mandarin, Korean, Burmese, Indian, Indonesian and African languages, in your time zone.
- [English Shortwave Broadcasts to Europe](https://perfectclock.cc/english-shortwave-europe): English shortwave broadcasts you can hear in Europe: Radio Romania, Voice of Vietnam, CRI, Voice of Korea, KBS and more, with frequencies, in your time zone.
- [English Shortwave Broadcasts to North America](https://perfectclock.cc/english-shortwave-north-america): English shortwave broadcasts for North America: WRMI, WBCQ, WWCR, WTWW, Radio Havana Cuba, Radio Romania, Radio Prague, with frequencies, in your time zone.
- [English Shortwave to Africa & the Middle East](https://perfectclock.cc/english-shortwave-africa): English shortwave broadcasts for Africa and the Middle East: BBC, Vatican Radio, TWR, CRI, VOA, ELWA Liberia and more, with frequencies, in your time zone.
- [English Shortwave to Asia & the Pacific](https://perfectclock.cc/english-shortwave-asia-pacific): English shortwave broadcasts for Asia and the Pacific: BBC, RNZ Pacific, Voice of Vietnam, Voice of Indonesia and more, with frequencies, in your time zone.
- [HF Weather Fax Schedule & Frequencies: Atlantic](https://perfectclock.cc/weather-fax-atlantic): HF radiofax schedule and frequencies for the Atlantic and Europe: DWD Pinneberg, Northwood, NOAA Boston and New Orleans, Sydney NS, Murmansk, in your time zone.
- [HF Weather Fax Schedule & Frequencies: Pacific](https://perfectclock.cc/weather-fax-pacific): HF radiofax schedule and frequencies for the Pacific: NOAA Point Reyes, Kodiak and Honolulu, Kagoshima (JFX), Shanghai, Seoul and Valparaíso, in your time zone.
- [HF Weather Fax Schedule: Australia & Indian Ocean](https://perfectclock.cc/weather-fax-indian-ocean): HF radiofax schedule for Australia, the Indian Ocean and South East Asia: Bureau of Meteorology Charleville and Wiluna, Bangkok, in your time zone.
- [UK & Irish Coastguard Weather Times & Frequencies](https://perfectclock.cc/maritime-weather-uk-ireland): When HM Coastguard and the Irish Coast Guard broadcast weather and maritime safety information on MF: Shetland, Stornoway, Humber, Malin Head, Valentia.
- [Coast Radio Weather: Biscay, Channel & North Sea](https://perfectclock.cc/maritime-weather-atlantic-europe): Coast radio weather times and frequencies for the Channel, the North Sea coast, Biscay and the Canaries: CROSS Corsen, Oostende, Coruña, in your time zone.
- [Mediterranean Coast Radio Weather Broadcast Times](https://perfectclock.cc/maritime-weather-mediterranean): When Mediterranean coast radio stations broadcast weather: CROSS La Garde, Spanish coast radio (Palma, Valencia, Cabo de Gata), Olimpia Radio and Varna.
- [Scandinavian Coast Radio Weather Broadcast Times](https://perfectclock.cc/maritime-weather-scandinavia): Coast radio weather broadcast times for the North Sea, the Baltic and the Arctic: Lyngby Radio, Stockholm Radio, Norwegian coast radio and Reykjavik Radio.
- [USCG HF Weather Broadcast Schedule & Frequencies](https://perfectclock.cc/maritime-weather-usa): US Coast Guard HF voice weather broadcast times and frequencies: Chesapeake (NMN), New Orleans (NMG), Point Reyes (NMC), plus Bermuda and the Caribbean.
- [Canadian Coast Guard Marine Weather Frequencies](https://perfectclock.cc/maritime-weather-canada): When Canadian Coast Guard stations broadcast marine forecasts on MF and HF: Halifax, Placentia, Labrador, Iqaluit and Prince Rupert, in your time zone.
- [Pacific HF Marine Weather Times: USCG, Taupo](https://perfectclock.cc/maritime-weather-pacific): HF maritime weather broadcasts for the Pacific: US Coast Guard Honolulu, Guam and Kodiak, Taupo Maritime Radio (New Zealand) and Bangkok, in your time zone.
- [Shipping Forecast Times: BBC Radio 4 Schedule](https://perfectclock.cc/shipping-forecast): What time is the Shipping Forecast on? BBC Radio 4 times: 00:48 and 05:34 daily, 17:54 at weekends, with the inshore waters forecast, in your time zone.
- [Numbers Stations & UVB-76 Schedule: When to Listen](https://perfectclock.cc/mystery-stations): When to hear numbers stations and UVB-76 "The Buzzer": E11, E06, E07, S06, V07 schedules and The Pip and Squeaky Wheel frequencies, in your time zone.
- [Remote Observatory Dark Hours & Moon-Free Time](https://perfectclock.cc/remote-observatory-dark-hours): When it is dark and moon-free at remote observatory sites in Australia, Chile, Namibia, Spain and the US: imaging windows in your time zone.
- [HF Contest Calendar: CQ WW, WPX & ARRL DX](https://perfectclock.cc/hf-contests): Ham Radio Contests This Weekend: CQ WW, CQ WPX, ARRL DX, IARU HF, WAE and Sweepstakes weekends, converted from UTC to your time zone.
- [VHF & UHF Contests: ARRL, CQ WW VHF, IARU R1](https://perfectclock.cc/vhf-uhf-contests): VHF and UHF contest calendar: ARRL January, June and September VHF, CQ WW VHF and IARU Region 1 contests, start and end in your time zone.
- [Weekly CW Contests: CWT, SST, MST & NCCC Sprint](https://perfectclock.cc/weekly-cw-contests): Weekly CW mini-contest schedule: CWops CWT, K1USN Slow Speed Test, ICWC Medium Speed Test and NCCC Sprint, converted from UTC to your time zone.
- [RTTY & FT8 Contest Calendar: CQ WW RTTY, WW Digi](https://perfectclock.cc/digital-contests): RTTY and FT8 contest calendar: ARRL RTTY Roundup, CQ WPX and CQ WW RTTY, BARTG, WW Digi, JARTS and WAE RTTY weekends in your time zone.

Calendars by category (all categories: https://perfectclock.cc/categories):

- [Sports](https://perfectclock.cc/sports): F1, NASCAR, NBA, NHL, MLB and the World Series, Champions League, UFC, tennis, skiing and marathons: start times in your time zone, many with Polymarket odds.
- [Polymarket](https://perfectclock.cc/polymarket): Polymarket odds on a timeline in your time zone: F1, NBA, NHL, UFC and football, Fed and CPI decisions, Bitcoin prices and rocket launches. Free, no sign-up.
- [Markets](https://perfectclock.cc/markets): Stock exchange trading hours, forex sessions with high-impact news, and Bitcoin and Ether options expiries: when markets open and move, in your time zone.
- [Shortwave](https://perfectclock.cc/shortwave): Shortwave schedules converted from UTC to your time zone: BBC, VOA, CRI and more, English by region, weather fax, coast radio and numbers stations.
- [Amateur Radio](https://perfectclock.cc/ham-radio): Amateur radio contest calendars: HF and VHF/UHF contest weekends, RTTY and FT8 contests and weekly CW mini-contests, converted from UTC to your time zone.
- [Astronomy](https://perfectclock.cc/astronomy): Astronomical night and moon-free hours at remote observatory sites in Australia, Chile, Namibia, Spain and the US, converted to your time zone.

## Optional

- [Privacy policy](https://perfectclock.cc/privacy-policy.html)
- [Terms of service](https://perfectclock.cc/terms-of-service.html)