I don't know. Maybe the index was created with SET DATE other than German and the form use a different settings of SET DATE (or the other way around). I try to avoid these problems by allways using DToS() instead of DToC() in index expression.

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>I'm using DToS() in a index and it working properly in RunTime.
>But why the last example with DToC() works well in VFP (not runtime) ?
>("Set Date" was German).