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Platform economic calendars are convenient and incomplete.

I use the in-platform filter as a secondary alert only. My primary sheet is my own night-before list with London times and blackout marks. Platform calendars sometimes miss what I care about or show impact ratings that do not match my pair map. External calendar plus my notes remains the source of truth; the platform filter is a seatbelt, not the steering wheel.

Concrete problems I have hit: an MT5 calendar showing a release one hour off after the clocks changed, a central bank speaker missing entirely, and a low-impact flag on a UK data point that moved cable 30 pips. None of that is a reason to stop using the built-in calendar. It is a reason not to rely on it alone.

My setup: the external calendar filtered to USD, EUR and GBP high and medium impact, copied by hand into a short list on Sunday night and checked again each evening. The platform alert pings five minutes before each event as a backup.

If the two disagree, I flatten toward the stricter reading. Convenience never wins that argument during London.

The UK data point flagged as low impact that moved cable 30 pips is the case that made me add my own impact column. The calendar's rating is a global opinion, and my list only cares what an event does to the pairs I trade.

So my sheet has the calendar rating and my rating beside it. UK CPI and retail sales are high for me whatever the platform says, while plenty of high rated releases from smaller economies are ignored.

The clock change point is timely, because this month has the awkward week. The UK goes back an hour on 25 October and the US not until 1 November, so from the 26th to the 30th a US release at 08:30 New York lands at 12:30 London, not 13:30.

That's the week the two calendars are most likely to disagree, and also the week my own habits are wrong. I write those five days of US times in red on the sheet so I don't trade from memory.

I agree with flattening toward the stricter reading, and if the two disagree by exactly one hour I treat both times as live. Does the in-platform filter let you add your own events, like a speaker the calendar missed?

LondonScalper, one weakness in hand copying is the copy itself. I audited my Sunday lists for a quarter and found 3 mistakes in roughly 140 entries, all of them time errors where I wrote the New York time and forgot to convert it.

None of them cost me money, because the platform alert caught each one. That changed how I see the seatbelt, since it turned out to be checking me more often than I was checking it.

The other case is rescheduling. Releases do get moved, sometimes by days when a statistics office is delayed, and a list copied on Sunday keeps the old slot unless the evening check is a real comparison rather than a glance.

So my evening pass is now line by line against the external calendar, with a tick next to each time. It takes about four minutes, which costs less than one bad fill would.

I would also question the five minute ping. By then I want to be flat already, so mine fires at fifteen minutes. What do you actually do in the five minutes after the alert sounds?