What Time Is It for G-d?

The world consists of various time zones. Consequently, commandments which are dependent on time take place at different times in the various places where Jews live. One region can be celebrating Shabbos, while another is busy at work.

Yet we are taught that every mitzvah is to be performed in its appointed time, since that is when the spiritual light that the commandment reflects shines from above. How then, does the light of Shabbos, for example, shine in various places at different times?