Mother's Day Dates in Different Countries

1. Norway - second Sunday in February
2. Israel - Shevat 30 (usually in February)
3. Georgia - March 3
4. Romania (and others) - March 8
5. UK and Ireland - fourth Sunday in Lent
6. Egypt (and others) - March 21
7. Spain (and others) - first Sunday in May
8. South Korea - May 8
9. Mexico (and others) - May 10
10. USA (and many others) - second Sunday in May
11. Poland - May 26
12. Bolivia - May 27
13. France (and others) - last Sunday in May
14. Thailand - August 12
15. Costa Rica - August 15
16. Argentina - second or third Sunday in October
17. Russia - last Sunday in November
18. Panama - December 8
19. Indonesia - December 22

Source: http://www.celebrating-mothersday.com/history/mothersday-dates.shtml