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Al hilo de la última propuesta usa funciones directas para eso, yo al menos las uso para los filtros y todo va ok:
function DateToStr(Date: TDateTime): string; overload;
function DateToStr(const DateTime: TDateTime; const FormatSettings: TFormatSettings): string; overload;
Description
Use DateToStr to obtain a string representation of a date value that can be used for display purposes.
The first form of DateToStr is not thread-safe, because it uses localization information contained in global variables. The second form of DateToStr, which is thread-safe, refers to localization information contained in the FormatSettings parameter. Before calling the thread-safe form of DateToStr, you must populate FormatSettings with localization information. To populate FormatSettings with a set of default locale values, call GetLocaleFormatSettings.
Aunque también deberías tener en cuenta la posibilidad de usar los parámetros y "parámetro".AsDate
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