Mother's Day is the most auspicious day in anyone’s life, this day can be consider as the most holy day as this day is celebrated to give the honor to God’s Best Gift of life i.e. Mothers and it’s like worship and show regards to motherhood, bond of love and care and the power of mothers in society. It is celebrated on various days in most of the parts of the world, yet most commonly in March, April, or May. It complements to Father's Day, the day to give honor to fathers.
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Festivals of mothers happen throughout the universe; a considerable lot of these might be traced back to antiquated celebrations, for example the Greek clique to Cybele, the Roman celebration of Hilaria or the Christian Mothering Sunday festival.

Mother’s day is celebrated in first half moths of the year in all over the world. All the country has some of the different days of celebrating mother’s day :
Below is the dates of the mother’s day coutry wise.

Mother's Day Dates 

12-Feb  Norway
3-Mar  Georgia
8-Mar  Afghanistan, Albania, Armenia, Azerbaijan, Belarus, Bosnia and Herzegovina, Bulgaria, Kazakhstan, Kosovo, Laos, Macedonia, Moldova, Montenegro, Morocco, Romania, Russia, Serbia, Slovenia, Ukraine, Vietnam.
18-Mar  Bangladesh, Ireland, Nigeria, United Kingdom
21-Mar (first day of spring)  Bahrain, Egypt, Iraq, Jordan, Kuwait, Lebanon, Libya, Oman, Palestinian Territories, Saudi Arabia, Sudan, Syria, United Arab Emirates, Yemen
25-Mar  Slovenia
7-Apr  Armenia (Mother's Day and Beauty Day) 
6-May (first Sunday in May)  Hungary, Lithuania, Mozambique, Portugal, Spain
8-May  South Korea (Parents' Day)
10-May  El Salvador, Guatemala, Mexico
13-May  Anguilla, Aruba, Australia, Austria, Bahamas, Barbados, Belgium, Belize, Bermuda, Bonaire, Botswana, Brazil, Brunei, Burma, Canada, Chile, China, Colombia, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Estonia, Ethiopia, Fiji, Finland, Germany, Ghana, Greece, Grenada, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Latvia, Liechtenstein, Macao, Malaysia, Malta, Netherlands, New Zealand, Pakistan, Peru, Philippines, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Singapore, Sint Maarten, Slovakia, South Africa, Sri Lanka, Suriname, Switzerland, Taiwan, Tanzania, Tonga, Trinidad and Tobago, Turkey, Uganda, Ukraine, United States, Uruguay, Venezuela, Vietnam, Zambia, Zimbabwe.  (second Sunday in May) 
15-May  Paraguay
26-May  Poland
27-May  Bolivia
27-May (last Sunday in May)  Algeria, Dominican Republic, Haiti, Mauritius, Morocco, Sweden, Tunisia, France and French Antilles (France is the last Sunday in May except if it coincides with Pentecost day (50th day after lent), in which case it is shifted to the first Sunday in June)
30-May  Nicaragua
1-Jun  Mongolia
12-Jun  Luxembourg -(second Sunday in June) 
26-Jun  Kenya - (last Sunday in June)
12-Aug  Thailand (Queen Sirikit Kitiyakara's birthday)
15-Aug  Costa Rica, Antwerp (Belgium)
10-Oct  Malawi - (second Monday in October)
14-Oct  Belarus
16-Oct  Argentina (third Sunday in October)
8-Dec  Panama
22-Dec  Indonesia
8-Dec Panama
22-Dec Indonesia