The　booming　demand　on　data　security　has　aroused　great　interest　for　developing　smart　materials　with　temporal　display　feature　and　dynamic　multicolor　fluorescence.　However,　it　remains　challenging　to　implement　both　features　on　most　responsive　molecules.　Herein,　we　construct　a　polymer　free　volume-controlled　“molecular　clock　and　emitter”　via　covalently　embedding　a　multi-stimuli　responsive　molecular　switch　(i.e.,　spiropyran)　into　a　polymer　network　(i.e.,　poly(pentafluorophenyl　acrylate))　with　programmable　crosslink　density　and　free　volume.　By　the　aminolysis　of　pentafluorophenyl　ester　with　different　amount　of　diamine　crosslinkers,　pPFPA-co-SP　networks　with　controllable　crosslink　densities　are　generated,　which　have　different　confinement　effects　on　the　rate　constant　of　SP/MC　isomerization,　thus　leading　to　time-dependent　photochromism.　In　addition,　PTF1,　a　fluorescent　probe　that　is　sensitive　to　polymer　rigidity,　is　introduced　to　further　endow　pPFPA-co-SP　system　with　phototunable　dynamic　full-color　emission.　Therefore,　relying　on　their　synergistical　responses　to　the　rigidity　of　the　polymer　network,　we　have　successfully　developed　a　versatile　molecular　clock　and　emitter　via　an　“one　stone　two　birds”　manner,　which　shows　time-dependent　data　display　along　with　dynamic　multicolor　fluorescence　switching,　providing　great　potential　for　advanced　encryption　and　anticounterfeiting　with　a　high　security　level.　©　2024　Wiley-VCH　GmbH.