You can sort clocks automatically or manually rearrange them however you want.
Choose View > Clocks.
Choose a sort option from the Sort pop-up menu at the bottom of the list. Clocks can be sorted:
alphabetically by city, time zone abbreviation, or alternate text,
by time,
by longitude of the associated city or time zone,
by longitude offset, that is by the difference between the longitude of the associated city or time zone and your local longitude, referred to the interval [-180°, +180 °],
by label.
To reverse the sort order, choose Ascending or Descending from the Sort pop-up menu.
To add a second sort option, choose Add Sort Option from the Sort pop-up menu.
To remove a sort option, choose Remove Sort Option from the Sort pop-up menu.
Choose View > Clocks.
Choose Manual Sorting from the Sort pop-up menu at the bottom of the list.
To move a clock to a different position, drag it in the list.
To reposition multiple clocks, select them and drag the selection to a new position.
To select clocks that are next to each other (contiguous) in the list, press the Shift key and then click the first and last clock; to select clocks that are not next to each other in the list, press the Command key and then click each clock.
You can also rearrange clocks directly from the Clocks palette by Command-clicking and dragging them.