4. The method according to claim 1 , wherein the generating corresponding time artifacts comprises, for one or more fixed original time references of the original time references depending on one or more fixed time bases of the time bases: determining, by the processor, the fixed time bases; and calculating, by the processor, the corresponding time values from the fixed original time references according to the fixed time bases.
4. The method according to claim 1 , wherein the generating corresponding time artifacts comprises, for one or more fixed original time references of the original time references depending on one or more fixed time bases of the time bases: determining, by the processor, the fixed time bases; and calculating, by the processor, the corresponding time values from the fixed original time references according to the fixed time bases. 5. The method according to claim 4 , wherein the determining the fixed time bases comprises: retrieving, by the processor, a creation date of the document from metadata thereof.