With Puddin's help, we've been able to grab this off the photos...
1) The time is accurate in Moscow, comparing the EXIF data to the clock at the Kremlin.
2) Comparing the sunset at Salvador (5.22pm on 24 Apr) and Matt's watch in Delhi, the camera clock wasn't changed all the way through, and has been in sync with GMT +4. (When it's 5.22pm in Brazil at GMT -3, the camera thinks it's 12.22am; when it's 11.12am in Delhi at GMT +5.30, the camera thinks it's 9.42am.)
3) That means he last set his camera clock to somewhere in the region of... Armenia/Azerbaijan/Georgia, Mauritius/Reunion/Seychelles and Oman?!
1) For Brazil, add one year, then minus 7 hours. (This assumes the clue box was set up on the 24th.)
2) For Auckland, add one year, then 8 hours.
3) For Cambodia, add one year, then 3 hours.
4) For India, add one year, and another 1.5 hours.
5) For Moscow, use the time stamp; but the date depends on whether he moved the time forwards or backwards.