We report results of proper-time evolution analyses of B decays at Belle,
based on a 29.1/fb data sample recorded at the Upsilon (4S) resonance. These
results include measurements of sin2phi_1, the lifetime of B-mesons, and the
mass-difference between two mass eigenstates of the B^0-B^0-bar system
(Delta-m_d). Delta-m_d is measured using three different methods: fully
reconstructed hadronic modes, a fully reconstructed semi-leptonic mode, and a
partially reconstructed D*+ pi- mode.Comment: 13 pages, contributed to the proceedings of the Fifth KEK Topical
Conference, 20-22, Nov. 2001, Tsukuba, Japa
