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The thermal time hypothesis proposed by Rovelli [1] regards the physicalbasis for the flow of time as thermodynamical and provides a definition of thetemperature for some special cases. We verify this hypothesis in the case of deSitter spacetime by relating the uniformly accelerated observer in de Sitterspacetime to the diamond in Minkowski spacetime. Then, as an application of it,we investigate the thermal effect for the uniformly accelerated observer with afinite lifetime in dS spacetime, which generalizes the corresponding result forthe case of Minkowski spacetime [2].  Furthermore, noticing that a uniformly accelerated dS observer with a finitelifetime corresponds to a Rindler observer with a finite lifetime in theembedding Minkowski spacetime, we show that theglobal-embedding-Minkowski-spacetime (GEMS) picture of spacetime thermodynamicsis valid in this case. This is a rather nontrivial and unexpectedgeneralization of the GEMS picture, as well as a further verification of boththe thermal time hypothesis and the GEMS picture.Comment: 10 pages, 3 figures, LaTeX; v2: reorganized with a new section added  concerning a generalization of the GEMS picture from our result; v3: version  with minor corrections, to appear in JHE

De Sitter thermodynamics from diamonds's temperature