May I have your attention please... DST has come into effect this month (March) around the world, but different countries have their different policies regarding when and how to change the clock. Some move 1 hour forward, some 2 hours forward and some in the southern hemisphere actually moves backward. What a mess!
If you use the economic calendar, please keep in mind that the some events might actually take place one hour earlier. Therefore, if the calendar is telling you "Next 4h", you should expect to check next 3 hours first before the 4th hour.