[Nick Beale]

I owe the following to Stave Coates who found it in a research guide published by the UK National Archives.

UK time varied as follows from:

16/4/39 - BST
19/11/39 - GMT
25/2/40 - BST
4/5/41 - BDST
10/8/41 - BST
5/4/42 - BDST
9/8/42 - BST
4/4/43 - BDST
15/8/43 - BST
2/4/44 - BDST
17/9/44 - BST
2/4/45 - BDST
15/7/45 - BST
7/10/45 - GMT

The Germans used CET (Central European Time) and GST (German Summer Time)

CET = GMT + 1 hour
GST = GMT + 2 hours

German time varied as follows:–

From
1/4/40 - GST
2/11/42 - CET
29/3/43 - GST
4/10/43 - CET
3/4/44 - GST
2/10/44 - CET
2/4/45 - GST
18/11/45- CET