US time zones

What do the abbreviations of US time zones like PDT mean? I can imagine that P stands for Pacific and T for Time - but what does D mean?

What time zone names and abbreviations do exist else?



Dipl.-Volkswirt (bdvb) Augustin (Political Economist)

PDT stands for Pacific Daylight Time
Others in North America are:

NST - Newfoundland Standard Time
NDT - Newfoundland Daylight Time
AST - Atlantic Standard Time
ADT - Atlantic Daylight Time
EST - Eastern Standard Time
EDT - Eastern Daylight Time
CST - Central Standard Time
CDT - Central Daylight Time
MST - Mountain Standard Time
MDT - Mountain Daylight Time
PST - Pacific Standard Time
AKST - Alaska Standard Time
AKDT - Alaska Daylight Time
HAST - Hawaii-Aleutian Standard Time
HADT - Hawaii-Aleutian Daylight Time