UTC timekeeping
Why are market prices stamped in Coordinated Universal Time, and what does that standard let traders compare?
In plain words
UTC is the single reference clock that exchanges use to timestamp trades, rather than any one country's local time. Because it does not shift with daylight saving and applies equally everywhere, every price in a data feed carries a moment that means the same thing in every city.
Why it matters
Markets run continuously across time zones, so a daily candle or a funding period would close at different moments for different users without a shared clock. UTC lets a trader line up their own local schedule against when volatility actually occurred, and makes data from different venues comparable to the minute.
In a real week: ETH, week of 16 June 2025
For ETH in the week of 16 June 2025 to 22 June 2025, the shared clock placed the week high of 2680.34 at 20:00 UTC on Monday 16 June, the largest hourly move of -5.07% at 21:00 UTC on Saturday 21 June, and the week low of 2111.89 at 20:00 UTC on Sunday 22 June. All three clustered late in the UTC day (16:00-23:59), a pattern visible only because every candle ends at the same global moment.
A common mistake
Assuming a UTC-stated day boundary matches one's local trading day. A calendar date in the data can straddle two different local dates, so local and stamped times must be converted before comparing sessions.