The Library

Concept family

Time, Sessions & Seasonality

Sessions, opening ranges, calendar effects, and cycle analysis.

Every market runs on a clock. At the shortest scale, session tools divide the day by market hours, since participation and volatility shift as Asia hands off to London and New York. The opening range extends that idea into a trading framework built from the first minutes of the day.

Zooming out, calendar studies look for tendencies tied to the day of the week, the month of the year, or recurring events like macro releases. Such effects show up in historical data but are debated in practice, since well-known anomalies tend to fade once traders act on them. Cycle analysis goes further and treats price as partly periodic, a stronger premise that remains contested. Dedicated seasonality displays tie the area together by charting an instrument's average path through the year.

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Sessions

Tools that segment the trading day by market hours and track how range, liquidity, and behavior differ by session, by time of day, and between regular and extended hours.

Opening range

The high and low of a session's first minutes form a reference bracket, and the breakout logic built on that bracket is a long-standing intraday trading approach.

Calendar effects

Recurring tendencies tied to the calendar, from day-of-week patterns to seasonal sayings like sell in May, documented in past data but prone to weakening once widely known.

Cycle analysis

Methods that look for rhythmic repetition in price, whether fixed intervals set by the analyst, dominant periods estimated from the data, or multi-year calendar rhythms.

Seasonality tooling

Purpose-built displays that aggregate years of history by month, week, or day of the year to show an instrument's typical seasonal path.