A ship sailing from the eastern extremity of the Aleutian Islands to Dutch harbour crosses 180° meridian at 23.30 hrs on January 1, 1999. What time and date will be recorded by the captain of the ship in his diary after one hour journey from the point of crossing of the meridian?

1. A ship sails west from the eastern Aleutian Islands towards Dutch Harbour (which is also in the Aleutians, west of the 180° meridian). 2. It crosses the 180° meridian (approximately the International Date Line - IDL) at 23:30 hrs on January 1, 1999. 3. The ship is traveling westward. 4. When crossing the IDL traveling westward, one gains a day. The time immediately after crossing becomes the same time but on the next date. 5. At the moment of crossing (23:30 hrs, Jan 1), the date immediately to the west of the IDL is January 2. The time is 23:30 hrs. 6. The question asks for the time and date recorded after one hour of journey *from the point of crossing*. 7. One hour after 23:30 hrs on January 2 is 00:30 hrs on January 2.