Dates in SharePoint and Dataverse are stored in UTC time, this probably accounts for the one-hour difference. You don't show your flow or what you're doing so it is hard to give advice, but just know that if you're adjusting the date/time somewhere, it's going to be stored in UTC time. You can use the convertTimeZone expression to convert UTC to GMT: convertTimeZone(utcNow(), 'UTC', 'GMT Standard Time')
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