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Layer ID's are unique to each layer and amending this field could cause problems.

[code]

alert(activeDocument.activeLayer.id);

[/code]

There is a layer metadata field that holds the time of the last update of the layer I.E.

[code]

alert(layerTime());

function layerTime(){

var ref = new ActionReference();

ref.putProperty(charIDToTypeID("Prpr"),stringIDToTypeID("metadata"));

ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );

var lt = executeActionGet(ref).getObjectValue(stringIDToTypeID("metadata")).getDouble(stringIDToTypeID("layerTime"));//seconds

return new Date(lt*1000.0).toLocaleString(); //change to milliseconds

};

[/code]

Good luck with your project.