Currently there is no date/datetime support for core workflow. It was not part of the specification because it would have blown up the effort. This is a feature/enhancement request. Hopefully we can support this any time soon.
This is a english speaking community, please do not use other languages to allow the widest possible audience to reach information. We’re generally not talking about ETAs and roadmaps. This is a feature request and not a guruanteed feature.
By now I can select datetime and date attributes with the usual date based condition selectors. I can’t tell exactly when it came, I’ma guess at some where between 5.2 to 6.0.