It depends on what time zone you are in.
It is 9:00 I did mental math
If your DS is set to the date/time of your location, it will go by that. Lets say it is June 23, a Tuesday in your location, then it will be Tuesday of June 23.
The day of the week in Pokemon diamond and pearl, is the same as your handhelds time and date i.e. if it's a Tuesday on your system, it's Tuesday on Pokemon
Tuesday 22-3-2011 in evening time
They're all further ahead. For example... When it is 10:38 p.m. on Monday in California it is: 6:38 a.m. Tuesday in England (8 hours ahead) 8:38 a.m. Tuesday in Greece (10 hours ahead) 3:38 p.m. Tuesday in Japan and.. (17 hours ahead) 7:38 p.m. Tuesday in New Zealand. (21 hours ahead)
Japan is nine hours ahead of the UK. So at 4 PM on Tuesday afternoon in the UK it will be 1 AM Wednesday morning in Japan.
In the path between Japan and Jamaica that does not cross the international date line, Japan is farther east.
The date was March eleventh, 2011, at 2:46 JST (Japan Standard Time).
Japan suffered its largest earthquake to date on Friday, March 11, 2011, at 2:46:23 PM (Japan Standard Time) at the epicenter.
1200 American Eastern Standard Time = 1700 UTC 1200 Eastern Daylight Saving Time = 1600 UTC 1200 Eastern Greenland Time = 1300 UTC 1200 Eastern Greenland Summer Time = 1200 UTC 1200 Eastern European Time = 1000 UTC 1200 East Africa Time = 0900 UTC 1200 Eastern European Summer Time = 0900 UTC 1200 Further-Eastern European Time = 0900 UTC 1200 East Timor Time = 0300 UTC 1200 Eastern Indonesian Time = 0300 UTC 1200 Australian Eastern Standard Time = 0200 UTC 1200 Eastern Summer Time = 0100 UTC
Because when flying either to Japan or America, you cross the International Date Line.