Zone 1 -
Entire states of Kansas and Missouri

Winter Shift at 0001 on 1 Oct

Summer Shift at 0001 on 1 May

Zone 2 -
Entire states of Arkansas, Oklahoma, and Tennessee

Winter Shift at 0001 on 15 Oct

Summer Shift at 0001 1 May

Upper state portion of Texas - above and including Plainview, Texas
Upper state portion of South Carolina - above and including Florence, South Carolina
Dissection lines extend horizontally across both states

Winter Shift at 0001 on 15 Oct

Summer Shift at 0001 on 1 May 

Zone 3 -
States of Texas, Mississippi, Alabama, and Georgia are dissected with a line from Midland, Texas to Savannah, Georgia
Portions north of that line 
Lower portion of South Carolina

Winter Shift at 0001 on 1 Nov 

Summer Shift at 0001 on I Apr 

Zone 4 -
Entire state of Louisiana, lower portions of Texas, Mississippi, Alabama, and Georgia south of dissection line in Zone 3
Upper portion of Florida

Winter Shift at 0001 on 1 Dec 

Summer Shift at 0001 on 1 Apr 

Zone 5 -
Guantanamo Bay, Cuba
Southern portion of Florida
Dissected with a line extending from Cedar Key, Florida on the western side to Ormond Beach, Florida on the eastern side
No change-Uniform of the day is service dress white (prescribed) and summer white (alternate) year round. 

CNRSE Zone Map-Uniform Shift 

PDF: CNRSE Zone Map