On 15 Apr 2013, at 17:57, Paul Eggert <eggert@CS.UCLA.EDU> wrote:

On 04/15/13 07:59, Tobias Conradi wrote:

Reserving D in %s for 1:00 offset as has been done over years, i.e. is
established practice

I'm not quite following all the proposal in this area, but "D"
also stands for "Double", as in BDST for British Double Summer Time.
There is a similar usage of "H" for Half, as in CKHST for
Cook Islands Half Summer Time.  If memory serves, CKHST, UYHST, etc.
are my own invention, while BDST is not: it comes from contemporaneous
British sources.  I came up with HST by analogy from DST.

Speaking of Britain,  it would be interesting to know how "D" and "S" would apply to GMT and BST.   You'd use BST for winter time and BDT for summer time perhaps?   It's a pity that BST is the daylight savings time and Britain is emotionally attached to GMT :)

jch