Hi @jordiew, there are some choices, but I think the SubstringExtractor is easier if the number of characters which should be extracted is fixed.

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@jordiew You can use the AttributeTrimmer to trim off groups of different characters, its intended use is to remove things like leading and trailing characters so you could give that a go.

If the part of the attribute you are trying to remove can change length and characters, then AttributeSplitter might be more useful to you, splitting on ":" to create a list attribute containing the various parts of you original attribute from here you can create a new attribute by concatenating list elements 0 and 1 and placing a ":" in between the 2 list values.

Have you tried the DateFormatter?