Enter your base time into cell B1. If you want the current time, enter:
=now()

Enter the text ESD, Zulu, Central, Mountain, and Pacific into cells B2,
C2, D2, E2 and F2 respectively

Enter the desired time differences into row 2 - i.e. type 0, 4, ...
etc into cells B3, C3, D3, E3 and F3 respectively (whatever these
differences are)

In cell B3 enter the formula
=$B1+B2/24
Copy this formula to the right across all cells in your table in row 3

Choose your preferred cell formatting. Move cells to your preferred
positions


--
John James
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