使用StrToDateTime和TFormatSettings进行转换不起作用 [英] Conversion with StrToDateTime and TFormatSettings does not work

问题描述

这段代码应该在Delphi XE2中工作，但是它在StrtoDateTime转换中给出了不是有效的日期和时间错误：

This code should work in Delphi XE2, but it gives "not a valid date and time" error in StrtoDateTime conversion:

procedure TForm2.Button1Click(Sender: TObject);
var
  s: string;
  d: TDateTime;
  FmtStngs: TFormatSettings;
begin
    GetLocaleFormatSettings(GetThreadLocale, FmtStngs);
    FmtStngs.DateSeparator := #32;
    FmtStngs.ShortDateFormat := 'dd mmm yyyy';
    FmtStngs.TimeSeparator := ':';
    FmtStngs.LongTimeFormat := 'hh:nn';

    s := FormatDateTime('', Now, FmtStngs);
    d := StrToDateTime(s, FmtStngs);
end;

任何提示？

推荐答案

如果要转换一些特殊的DateTime格式，您应该更好地使用 VarToDateTime 而不是StrToDateTime。只要看看两者的实现，你会认识到，StrToDateTime是不知何故的... VarToDateTime会询问操作系统是否不能自己确定。

If you want to convert some special DateTime-Formats you should better use VarToDateTime instead of StrToDateTime. Just have a look at the implementation of both and you will recognize, that StrToDateTime is somehow ... and VarToDateTime will ask the OS if it can't determine by itself.

这适用于Delphi XE3（但也应该与早期版本一起使用）：

This works with Delphi XE3 (but should also work with earlier versions):

procedure TForm2.Button1Click( Sender: TObject );
var
  s: string;
  d: TDateTime;
  FmtStngs: TFormatSettings;
begin
    GetLocaleFormatSettings( GetThreadLocale, FmtStngs );
    FmtStngs.DateSeparator := #32;
    FmtStngs.ShortDateFormat := 'dd mmm yyyy';
    FmtStngs.TimeSeparator := ':';
    FmtStngs.LongTimeFormat := 'hh:nn';

    s := FormatDateTime( '', Now, FmtStngs );
    d := VarToDateTime( s );
end;

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