TWS chart and API timestamps use different time zones

Quick answer

Record the time zone attached to each timestamp. The TWS operator time zone, an exchange time zone, and UTC can describe the same event with different clock times. Align zones before declaring an alert late.

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Step by step

1 In the TWS chart, open Edit → Chart Parameters. Read Show data in user time zone under Chart Time Options. Write down the chart zone and the app log’s time-zone rule; do not assume they match.
2 For TWS operator time, check More Options on the login screen during your next planned login.
3 Check whether the API request explicitly uses an exchange zone or UTC.
4 Convert a single known event into one comparison zone.
5 Account for daylight-saving changes when comparing dates across the year.

A practical example

A log uses UTC while a chart uses the exchange’s local time. The same event will show two clock times. Pick one event you can find in both places and convert its time. Do this before measuring a delay. A one-hour or several-hour gap may be a zone mismatch, not slow order routing. Note the date too, because daylight-saving changes can shift the offset.

Illustrative scenario, not a record of a trade placed during this review.

Screen reference

TWS Chart Parameters showing time period, data type, bar type, volume, VWAP and session controls — Compare Time period and What to show first. Additional Data and Features contains Volume and VWAP of the bar. Chart Time Options contains the extended-hours and user-time-zone controls. The dialog was closed with Cancel; no settings were applied. Captured in TWS paper mode on 3 October 2026. Open the image for full size.

How to confirm the result The same event should line up after conversion, even if displayed clock times differ.

Mistake to avoid

Do not change session settings in the middle of active automation just to make a screenshot match.

Common questions

Is my computer clock the only time zone involved?

No. Broker, exchange, chart, and app settings may differ.

Does a one-hour gap always mean latency?

No. First check time zones and daylight-saving rules.

TWS delayed versus live data: how to tell Paper TWS has no market data: what to check Quotes work in TWS but not through the API

Financial and information disclaimers

Financial disclaimer

These guides explain software. They are for education, not financial, investment, tax, or legal advice. No example is a suggestion to buy or sell a product or use a trading strategy. Trading can lose money, including all funds you put at risk. With margin, futures, short sales, or some options, losses can exceed your starting funds. Automation can fail, send duplicate orders, or act late. Stops do not guarantee a fill or a price. Review your orders and positions, and seek advice from a qualified professional for your own needs. Paper trades, examples, and past results do not predict live results or promise a profit.

Information disclaimer

This is general help based on the sources and check date shown on the page. Screens, settings, fees, data access, and product support can change or differ by app version, account, country, and broker. The content may contain errors or become out of date; accuracy, completeness, and continuous service are not guaranteed. Check current broker and app instructions before acting. Screenshots show where controls are; they do not prove that an order test passed. This guide does not replace broker terms or risk notices. References to IBKR and TradingView identify their products and do not imply their endorsement of this guide.