Previous day and week levels, and how to write them as a condition
The most watched levels on any chart are the plainest: where yesterday topped and bottomed, where today opened, where last week's range sat. SixOne8 has four indicators built on the calendar rather than on arithmetic. This guide is what each one holds, when it is active, and the comparisons it offers.
The four indicators
- Previous day / week high and low. Yesterday's high and low, or last week's, held flat through today or this week. They change once, at the roll.
- Daily open. The price the current day opened at, held flat for the rest of the day.
- Weekly open. The same for the week.
- Session high and low. The high and low of one trading session — Asia, London or New York — once that session has ended, and only for as long as you keep the range active: four, eight or twelve hours after the close, or until the session next ends.
All of them follow the instrument's trading session, not the clock. A forex day runs from one New York close to the next; a crypto day is midnight to midnight UTC. So "yesterday's high" is the high of the previous daily candle as the app draws it, which is the same high the Previous Day indicator reads. A session condition has to read a timeframe of 1 hour or shorter, and 30 minutes or shorter for a session that opens or closes on the half hour, so that the session boundary lands on a bar close.
Writing them as a condition
The range indicators — previous period and session — share one set of comparisons, in the builder's own words.
- Price above / inside / below the range. Where the bar closed relative to the high and low. States. All three are false until the range has finished forming — before yesterday has ended there is no yesterday — and once it is no longer active.
- Price crosses above / below the range. True only on the bar the close moves through the high or the low. The moment, and the usual trigger.
- Price sweeps the high / sweeps the low. The bar traded beyond the level and closed back inside it. The wick went through; the close did not. A bar that closes beyond is a cross, not a sweep. True only on that bar.
The open indicators are a single level and offer price above, price below, and price crosses above / below.
Previous Day High/Low on 15m · price sweeps the high
Read it as a sentence: on the 15-minute chart, this bar traded above yesterday's high and closed back below it. That is what the scanner evaluates at each 15-minute close, and the sweep is the condition most strategies built on these levels are watching for — the test of a level that failed.
Why the calendar matters
These levels work, when they work, for the same reason pivots do: they are the ones a great many people have on their charts, and they are the same for everyone because the calendar is. That is also why the session matters. A "daily high" measured midnight-to-midnight on a forex pair is a level nobody else is watching, and the app's insistence on the instrument's own session is what keeps the level the one that is actually drawn on other people's screens.
Before you trust them
Run an entry check. It will tell you whether, on the market you care about, the moments this condition fired moved any differently from a random moment over the history tested. That is a fact about the past on that market, and it is the only kind of fact a test here produces.