時差っていったい何？
What is "time difference"?

冬 0      +1        +2        +3     +5.4      +5.5    +6.5      +7          +8           +9        -10       -8             -7     -6           -5                冬 0

夏 +1     +2　      +3        +4     +5.4      +5.5    +6.5      +7          +8           +9        -10       -7             -6     -5           -4                夏 +1

 London  Stockholm  Istanbul  Moscow Kathmandu Delhi   Yangon    Ho Chi Minh Denpasar     Tokyo     Honolulu  Seattle        Denver Chicago      New York          London
         Copenhage  Cairo                                        Bangkok     Hong Kong    Seoul               Dallas                Dallas       (La Guadia)
         Berlin                                                  Jaka        Manila                           Vancouver             Mexico City  (John F. Kennedy)
         Munich                                                              Taipei                           San Francisco                      (Newark)
         Warsaw                                                              Singapore                        Los Angeles                        Miami
         Budapest                                                            Kuala Lunpur                     Las Vegas                          Washington
         Prague                                                              Beijing                                                             (Dulles)
         Amsterdam                                                           Shanghai                                                            (National)
         Zurich                                                              Dalian                                                              Atlanta
         Geneva                                                                                                                                  Boston
         Vienna                                                                                                                                  Detroit
         Barcelona                                                                                                                               Orlando
         Madrid
         Milan
         Rome
         Frankfurt
         Paris

GMT(冬→夏）     Moscow(冬→夏）           　 　                                    Honolulu　　　LAX(冬→夏)       NYC(冬→夏)                    GMT(冬→夏）  　
 GMT  +1    +2   Moscow   +4    +5    +6   BKK   +8   TKY    +10    +11   IDL  -11   HNL   -9     LAX   -7    -6  　NYC 　-4    -3    -2    -1    GMT

by Arthur