Based on UonumaRobert's great Time Zones activity.
I made a Snoopy-themed version, since Snoopy is so popular with my students.
Each slide contains a small culture showcase of the local area as well as the distance from (Kobe) Japan and + or - hours in relation to Japan's current time.
I recommend deciding on a time that's close to your current time, rounding up/down if needed, then using that time as a base to calculate all others.
There's also a worksheet with a blank map for students to write their answers down.
Canada's represented twice, but Newfoundland has one of those fun .5 time zones, so I threw that in as the final question for a bit of a challenge. I chose the countries based on the countries my students should know the English names for, so I also recommend when the country's flag comes up, asking the students if they remember what country it is.
Forgot to compress the images, so the file size was way too big. Re-uploaded a compressed version that's much smaller.