Direct answer
In forex charting, “Do Sunday charts start over” usually means one of two things: a new weekly candle appears at the start of a new week, or your platform’s session/time-zone settings cause the weekly candles to line up differently around Sunday. There is no single, universal visual behavior that applies to all charting setups; what you see is determined by how the chart defines the weekly period and how it handles gaps when markets are less liquid.
Explanation: what “start over” can mean
A common interpretation is that the weekly chart resets on Sunday because a new time bucket begins. In practice, a “weekly candle” is a label for an interval such as Monday-to-Sunday (or another 7-day definition). When that interval boundary is reached, the next candle starts building—so the display looks like a reset.
Another interpretation is that data around Sunday may be delayed, sparse, or aggregated differently. Forex trading is decentralized, and liquidity can change when the market is quieter. Depending on the data feed and chart settings, the chart may show a jump, a blank gap, or a different alignment of OHLC values, which can also look like “starting over.”
How it works in a chart (definitions and checks)
To understand your specific chart behavior, focus on three items:
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Time zone: The chart converts timestamps into a chosen time zone. If the time zone differs from your expectation, the weekly boundary may appear to shift.
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Week boundary definition: Some chart settings treat the week as starting on Monday, while others effectively start the weekly candle at a different moment due to time-zone conversion.
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Session handling / candle building: A candle’s OHLC values are computed from the data that falls inside the candle’s interval. If your feed provides fewer updates around Sunday, the candle may form differently (for example, more slowly), again creating the impression that the chart “restarts.”
Example checks (independent verification)
- Compare the timestamp labels of the first weekly candle after Sunday to see exactly when your platform considers the new week to begin.
- Toggle or note your chart time zone and re-check the weekly boundary alignment.
- Zoom in around the Sunday transition and observe whether the change is exactly at the weekly boundary (a new candle) or spread across a wider time window (suggesting session/data handling differences).
Limitations and risks of misreading the chart
Even if weekly candles “start over,” that does not imply anything about the market fundamentals. It only reflects candle construction and time definitions. Also, the appearance of a reset can be caused by data availability and chart settings, not by any standardized Sunday rule. Therefore, the safest interpretation is functional: “a new weekly interval begins according to my chart’s time-zone and week-definition settings,” rather than “the market resets.”