🕰️ Crypto Session Clock

See which trading session is active (Asia, Europe, US) and the time to the US stock market open, then a heatmap of average range and volume by hour and weekday measured from real Binance data. Not investment advice.

Loading Data: Binance public API and WebSocket (spot USDT 1h candles), your browser's clock and time-zone data

🕰️ Which markets are open now

Each market's regular hours (local time) are converted with your browser's time-zone data, so London and New York daylight saving time is applied automatically. Holidays and half days are not reflected. Crypto trades around the clock; a "session" here simply means the hours when that region's stock market is open.

📊 Volatility and volume by hour and weekday

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Show the hourly table

Range = (high − low) ÷ open and |return| = |close ÷ open − 1|, each measured per 1-hour candle and averaged. Volume is in USDT. Only closed candles are used; the candle still forming appears only in "This hour so far". These are past patterns and can change.

Shortcuts: 123 period · M measure · Z time zone · / coin input

Trading hours used here

Market	Regular hours (local, weekdays)	Time zone
Tokyo (TSE)	09:00–11:30 · 12:30–15:30 (lunch break 11:30–12:30)	Asia/Tokyo · UTC+9
Seoul (KRX)	09:00–15:30	Asia/Seoul · UTC+9
London (LSE)	08:00–16:30	Europe/London · UTC+0 / summer UTC+1
New York (NYSE, Nasdaq)	09:30–16:00	America/New_York · UTC−5 / summer UTC−4

Regular sessions only: pre-market, after-hours, auction extensions and alternative venues' extended hours are not included. The TSE moved its close from 15:00 to 15:30 in November 2024. "Asia" means Tokyo or Seoul is open, "Europe" means London, "US" means New York.

For information only, not investment advice. Data comes from exchanges' public APIs and may be delayed or interrupted. Charts: TradingView Lightweight Charts™

What this tool does

A clock that shows, in Korea time, whether the Asian, European or US trading session is on, combined with hour-of-day and weekday statistics of range and volume measured from real Binance 1-hour candles. It counts down to the regular open and close of the Tokyo, Seoul, London and New York stock markets to the second and draws today's trading hours on a 24-hour ring. Below, it shows the last 30, 90 or 180 days of any Binance spot USDT coin (BTC, ETH, SOL and the rest) as a weekday × hour heatmap and hourly bars, and compares the 1-hour candle forming right now with the average for this hour in real time.

How it is calculated

Market hours are defined as regular sessions in local time: Tokyo Stock Exchange 09:00–11:30 and 12:30–15:30 (lunch break 11:30–12:30), Korea Exchange 09:00–15:30, London Stock Exchange 08:00–16:30, New York (NYSE, Nasdaq) 09:30–16:00, Monday to Friday. Those local times are converted with your browser's time-zone data (Intl with Asia/Tokyo, Asia/Seoul, Europe/London, America/New_York), so London and New York daylight saving changes are applied automatically, and the next clock change within 120 days is shown. Holidays and half days are not reflected. Statistics come from Binance spot 1-hour candles via the public API (fetched 1,000 at a time; 180 days takes 5 requests). For each closed candle the tool computes range = (high − low) ÷ open, |return| = |close ÷ open − 1| and quote volume in USDT, then averages them per weekday and hour in the display time zone (KST, UTC or your local time). Volume share = the cell's (or hour's) total volume ÷ total volume over the period. The summary's "largest" window is the pair of consecutive hours with the highest average range. Candles are saved in this browser for up to 6 coins and 181 days, and only newly closed candles are fetched on the next visit. "This hour so far" receives the forming candle through one combined WebSocket stream (kline_1h) and shows range so far ÷ the full-hour average range for this hour, and volume so far ÷ (average volume for this hour × elapsed fraction).

Read Korea time and UTC at the top (plus your local time if you are elsewhere), which of Asia, Europe and the US is open, and how long until the next open or close

On the 24-hour ring, the four inner tracks are today's hours for Tokyo, Seoul, London and New York, and the outer ring is the chosen coin's measure by hour. Switch the display time zone between KST and UTC at the top right

Type a symbol such as BTC or ETH in Coin (no need to add USDT) and choose 30, 90 or 180 days. To compare, enter a second coin in Compare

Pick range, |return|, volume or volume share, then tap or hover a heatmap cell to see that weekday and hour's values and sample count below

Check "This hour so far" to see how many times the average for this hour the forming candle has moved. Download the weekday × hour table with CSV and share the same setup with Copy link

How to read each section

Clock and market cards

Korea time appears large at the top with UTC beside it; on a device set to another time zone your local time appears too. The Now line shows Asia when Tokyo or Seoul is open, Europe for London and US for New York, and adds Europe–US overlap while London and New York are both open. Each market card shows its state (Open, Lunch break, Closed, Weekend), the time left to the close or open, that day's hours in the display time zone and in local time, the current UTC offset with whether daylight saving is in effect, and the next clock change.

24-hour ring

Clockwise from 0:00 at the top to 24:00, this is today in the display time zone. The four inner tracks are Tokyo, Seoul, London and New York from the outside in, and the colored parts are when each is open that day (empty on weekends). The white hand is now. The outer ring shades the chosen coin's measure by hour; brighter means higher.

This hour so far

The large number is the forming 1-hour candle's range so far divided by the full-hour average range for this hour over the period. The gauge's middle tick is 1× (equal to average) and its end is 2×. The average for the same weekday and hour is shown too, and volume is compared as a pace by scaling the average to the elapsed share of the hour. The multiple also appears in the browser tab title.

Summary, heatmap, bars and table

The summary is computed from the data: the two hours with the largest average range, the calmest two hours, the hour with the largest share of volume, and the weekdays that moved most and least. The heatmap is 7 weekday rows × 24 hours on wide screens and 24 hour rows × 7 weekdays on phones, with the current cell outlined. Hourly bars sit side by side when comparing two coins; volume is then converted to share (%) because the sizes differ. The table view and CSV hold the same numbers with sample counts.

Things to know

Averages are pulled by a few large moves. With 30 days each cell has only about 4 samples, so it is noisy; 180 days is smoother but mixes in older market conditions. Check whether the same shape survives across periods

When daylight saving changes, the London and New York opens shift by an hour in Korea time. The heatmap groups by the display time zone, so the same event can land in different cells before and after the change

Monday early morning in Korea time is Sunday afternoon in the US. Switch to UTC if you prefer a Western view

The range multiple in "This hour so far" compares a candle still forming with a full-hour average, so it starts small just after the top of the hour. The volume pace is adjusted for elapsed time

Holidays and half days are not reflected, so the clock can say Open while the real market is closed for a holiday

Frequently asked questions

Crypto trades 24/7, so why sessions?

The crypto market itself never opens or closes, but trading is often said to cluster when a region's stock and futures markets are open. Instead of taking that on faith, this tool measures range and volume by hour from the chosen coin's actual 1-hour candles. A session here simply means the regular hours of that region's stock market.

How is daylight saving time handled?

Market hours are stored in local time (for example 09:30 in New York) and converted to the day's Korea time with your browser's time-zone data (America/New_York, Europe/London). During US daylight saving the New York open is 22:30 KST and becomes 23:30 KST when it ends, automatically, and each market card shows the next clock change. Tokyo and Seoul do not use daylight saving.

Are holidays included?

No. Public holidays, ad hoc closures and half days differ by country and year and cannot be computed reliably, so they are left out. Only local weekends (Saturday and Sunday) are treated as closed.

What data are the statistics based on?

Binance spot USDT 1-hour candles. Only closed candles are used; for each one the tool computes (high − low) ÷ open, |close ÷ open − 1| and USDT volume, and averages them per weekday and hour. Newly listed coins use whatever history exists, and the page says so. KRW markets on other exchanges such as Upbit can have a different intraday shape.

Does it make many requests? Where is data stored?

On first open it fetches 1-hour candles 1,000 at a time for the period (5 requests for 180 days) and keeps them in this browser's storage (localStorage). Later visits fetch only candles that closed since. Up to the 6 most recently viewed coins are kept, and neither settings nor candles are sent to any server. The live feed uses one WebSocket connection, which closes when the tab has been hidden for over a minute and reconnects when you return.

Is it better to trade during the most volatile hours?

This tool only describes when prices moved most in a past period; it does not suggest when to buy or sell. A large range means big swings, not a direction, and patterns change with market conditions.

For information only, not investment advice. Market hours are regular sessions and do not reflect holidays. Data comes from exchanges' public APIs and may be delayed or interrupted.