| Date | Country | Holiday name |
|---|---|---|
| 1990-04-01 |  Cyprus | Cyprus National Day |
| 1990-04-01 |  Iran | Islamic Republic Day |
| 1990-04-01 |  San Marino | Inauguration Ceremony |
| 1990-04-02 |  Argentina | Day of the veterans and the fallen in Malvinas War |
| 1990-04-02 | Iran | Sizdah Bedar |
| 1990-04-03 |  Guinea | National Holiday |
| 1990-04-04 |  Angola | Peace Day |
| 1990-04-04 |  Senegal | National Holiday |
| 1990-04-04 |  Taiwan | Children's Day |
| 1990-04-05 |  Switzerland | Näfelser Fahrt |
| 1990-04-05 |  China | Qingming Festival |
| 1990-04-05 |  Hong Kong | Qingming Festival |
| 1990-04-05 | Taiwan | Tomb Sweeping Day |
| 1990-04-05 |  Vietnam | Hung Kings Commemorations |
| 1990-04-06 |  Burundi | Ntaryamira Day |
| 1990-04-06 |  Cocos (Keeling) Islands | Self Determination Day |
| 1990-04-06 |  Thailand | Chakri Memorial Day |
| 1990-04-07 |  Mozambique | Women’s Day |
| 1990-04-07 |  Rwanda | Genocide Memorial Day |
| 1990-04-07 |  Tanzania | Karume Day |
| 1990-04-09 |  Georgia | National Unity Day |
| 1990-04-09 |  Philippines | Day of Valor |
| 1990-04-09 |  Tunisia | عيد الشهداء |
| 1990-04-09 |  Kosovo | Constitution Day |
| 1990-04-10 |  Israel | Passover (Pesach) |
| 1990-04-10 |  Montenegro | Pesach |
| 1990-04-11 |  Costa Rica | Gesta Heroica de Juan Santamaría |
| 1990-04-12 | Argentina | Maundy Thursday |
| 1990-04-12 |  Colombia | Maundy Thursday |
| 1990-04-12 | Costa Rica | Maundy Thursday |
| 1990-04-12 |  Denmark | Maundy Thursday |
| 1990-04-12 |  Ecuador | Maundy Thursday |
| 1990-04-12 |  Spain | Maundy Thursday |
| 1990-04-12 |  Faroe Islands | Maundy Thursday |
| 1990-04-12 |  Greenland | Maundy Thursday |
| 1990-04-12 |  Guatemala | Maundy Thursday |
| 1990-04-12 |  Honduras | Maundy Thursday |
| 1990-04-12 | Canary Islands | Maundy Thursday |
| 1990-04-12 |  Iceland | Maundy Thursday |
| 1990-04-12 |  Nicaragua | Maundy Thursday |
| 1990-04-12 |  Norway | Maundy Thursday |
| 1990-04-12 |  Peru | Maundy Thursday |
| 1990-04-12 | Philippines | Maundy Thursday |
| 1990-04-12 |  Paraguay | Maundy Thursday |
| 1990-04-12 |  Svalbard & Jan Mayen | Maundy Thursday |
| 1990-04-12 |  El Salvador | Maundy Thursday |
| 1990-04-12 |  Uruguay | Maundy Thursday |
| 1990-04-12 |  Venezuela | Maundy Thursday |
| 1990-04-12 |  U.S. Virgin Islands | Maundy Thursday |
| 1990-04-12 |  Brunei | Nuzul Al-Quran |
| 1990-04-12 |  Malaysia | Day of Nuzul Al-Quran |
| 1990-04-13 |  Andorra | Good Friday |
| 1990-04-13 |  Antigua & Barbuda | Good Friday |
| 1990-04-13 |  Anguilla | Good Friday |
| 1990-04-13 | Angola | Good Friday |
| 1990-04-13 | Argentina | Good Friday |
| 1990-04-13 |  Australia | Good Friday |
| 1990-04-13 |  Aruba | Good Friday |
| 1990-04-13 |  Åland Islands | Good Friday |
| 1990-04-13 |  Barbados | Good Friday |
| 1990-04-13 |  Bulgaria | Good Friday |
| 1990-04-13 |  Bermuda | Good Friday |
| 1990-04-13 |  Bolivia | Good Friday |
| 1990-04-13 |  Caribbean Netherlands | Good Friday |
| 1990-04-13 |  Brazil | Good Friday |
| 1990-04-13 |  Bahamas | Good Friday |
| 1990-04-13 |  Botswana | Good Friday |
| 1990-04-13 |  Belize | Good Friday |
| 1990-04-13 |  Canada | Good Friday |
| 1990-04-13 | Switzerland | Good Friday |
| 1990-04-13 |  Cook Islands | Good Friday |
| 1990-04-13 |  Chile | Good Friday |
| 1990-04-13 |  Cameroon | Good Friday |
| 1990-04-13 | Colombia | Good Friday |
| 1990-04-13 | Costa Rica | Good Friday |
| 1990-04-13 |  Cuba | Good Friday |
| 1990-04-13 |  Cape Verde | Good Friday |
| 1990-04-13 |  Curaçao | Good Friday |
| 1990-04-13 |  Christmas Island | Good Friday |
| 1990-04-13 | Cyprus | Good Friday |
| 1990-04-13 |  Czech Republic | Good Friday |
| 1990-04-13 |  Germany | Good Friday |
| 1990-04-13 | Denmark | Good Friday |
| 1990-04-13 |  Dominica | Good Friday |
| 1990-04-13 |  Dominican Republic | Good Friday |
| 1990-04-13 | Ecuador | Good Friday |
| 1990-04-13 |  Estonia | Good Friday |
| 1990-04-13 |  Eritrea | Orthodox Good Friday |
| 1990-04-13 | Spain | Good Friday |
| 1990-04-13 |  Ethiopia | Good Friday |
| 1990-04-13 |  Finland | Good Friday |
| 1990-04-13 |  Fiji | Good Friday |
| 1990-04-13 | Faroe Islands | Good Friday |
| 1990-04-13 |  United Kingdom | Good Friday |
| 1990-04-13 |  Grenada | Good Friday |
| 1990-04-13 | Georgia | Good Friday |
| 1990-04-13 |  Guernsey | Good Friday |
| 1990-04-13 |  Ghana | Good Friday |
| 1990-04-13 |  Gibraltar | Good Friday |
| 1990-04-13 | Greenland | Good Friday |
| 1990-04-13 |  The Gambia | Good Friday |
| 1990-04-13 |  Guadeloupe | Good Friday |
| 1990-04-13 |  Republic of Equatorial Guinea | Good Friday |
| 1990-04-13 |  Greece | Good Friday |
| 1990-04-13 | Guatemala | Good Friday |
| 1990-04-13 |  Guyana | Good Friday |
| 1990-04-13 | Hong Kong | Good Friday |
| 1990-04-13 | Honduras | Good Friday |
| 1990-04-13 |  Haiti | Good Friday |
| 1990-04-13 | Canary Islands | Good Friday |
| 1990-04-13 |  Indonesia | Good Friday |
| 1990-04-13 |  Isle of Man | Good Friday |
| 1990-04-13 | Iceland | Good Friday |
| 1990-04-13 |  Jersey | Good Friday |
| 1990-04-13 |  Jamaica | Good Friday |
| 1990-04-13 |  Kenya | Good Friday |
| 1990-04-13 |  St. Kitts & Nevis | Good Friday |
| 1990-04-13 |  Cayman Islands | Good Friday |
| 1990-04-13 |  St. Lucia | Good Friday |
| 1990-04-13 |  Lichtenstein | Good Friday |
| 1990-04-13 |  Liberia | Fast and Prayer Day |
| 1990-04-13 |  Lesotho | Good Friday |
| 1990-04-13 |  Latvia | Good Friday |
| 1990-04-13 | Montenegro | Good Friday |
| 1990-04-13 |  Martinique | Good Friday |
| 1990-04-13 |  Montserrat | Good Friday |
| 1990-04-13 |  Malta | Good Friday |
| 1990-04-13 |  Malawi | Good Friday |
| 1990-04-13 | Malaysia | Good Friday |
| 1990-04-13 |  Namibia | Good Friday |
| 1990-04-13 |  Nigeria | Good Friday |
| 1990-04-13 | Nicaragua | Good Friday |
| 1990-04-13 | Norway | Good Friday |
| 1990-04-13 |  New Zealand | Good Friday |
| 1990-04-13 |  Panama | Good Friday |
| 1990-04-13 | Peru | Good Friday |
| 1990-04-13 | Philippines | Good Friday |
| 1990-04-13 |  Portugal | Good Friday |
| 1990-04-13 | Paraguay | Good Friday |
| 1990-04-13 |  Romania | Good Friday |
| 1990-04-13 |  Serbia | Orthodox Good Friday |
| 1990-04-13 | Rwanda | Good Friday |
| 1990-04-13 |  Seychelles | Good Friday |
| 1990-04-13 |  Sweden | Good Friday |
| 1990-04-13 |  Singapore | Good Friday |
| 1990-04-13 |  St. Helena | Good Friday |
| 1990-04-13 | Svalbard & Jan Mayen | Good Friday |
| 1990-04-13 |  Slovakia | Good Friday |
| 1990-04-13 |  Sierra Leone | Good Friday |
| 1990-04-13 |  Suriname | Good Friday |
| 1990-04-13 | El Salvador | Good Friday |
| 1990-04-13 |  Sint Maarten | Good Friday |
| 1990-04-13 |  Swaziland | Good Friday |
| 1990-04-13 |  Turks & Caicos Islands | Good Friday |
| 1990-04-13 | Thailand | Songkran Festival |
| 1990-04-13 |  Tonga | Good Friday |
| 1990-04-13 |  Trinidad & Tobago | Good Friday |
| 1990-04-13 | Tanzania | Good Friday |
| 1990-04-13 |  Uganda | Good Friday |
| 1990-04-13 | Uruguay | Good Friday |
| 1990-04-13 |  St. Vincent & Grenadines | Good Friday |
| 1990-04-13 | Venezuela | Good Friday |
| 1990-04-13 |  British Virgin Islands | Good Friday |
| 1990-04-13 | U.S. Virgin Islands | Good Friday |
| 1990-04-13 |  Vanuatu | Good Friday |
| 1990-04-13 |  South Africa | Good Friday |
| 1990-04-13 |  Zambia | Good Friday |
| 1990-04-13 |  Zimbabwe | Good Friday |
| 1990-04-13 |  Papua New Guinea | Good Friday |
| 1990-04-13 |  United States of America | Good Friday (KY) |
| 1990-04-14 | Australia | Easter Saturday |
| 1990-04-14 |  People's Republic of Bangladesh | Bengali New Year's Day |
| 1990-04-14 | Botswana | Easter Saturday |
| 1990-04-14 | Belize | Easter Saturday |
| 1990-04-14 | Fiji | Easter Saturday |
| 1990-04-14 | Georgia | Easter Saturday |
| 1990-04-14 | Guatemala | Easter Saturday |
| 1990-04-14 | Hong Kong | Easter Saturday |
| 1990-04-14 | Honduras | Día de las Américas |
| 1990-04-14 | Seychelles | Easter Saturday |
| 1990-04-14 | El Salvador | Easter Saturday |
| 1990-04-14 | Thailand | Songkran Festival |
| 1990-04-14 |  Laos | Lao New Year's Day |
| 1990-04-14 | Papua New Guinea | Holy Saturday |
| 1990-04-15 | Andorra | Easter Sunday |
| 1990-04-15 |  Albania | Catholic Easter |
| 1990-04-15 | Albania | Orthodox Easter |
| 1990-04-15 |  Austria | Easter Sunday |
| 1990-04-15 | Australia | Easter Sunday |
| 1990-04-15 |  Bosnia and Herzegovina | Easter Sunday |
| 1990-04-15 | Bosnia and Herzegovina | Orthodox Easter |
| 1990-04-15 |  Burkina Faso | Easter Sunday |
| 1990-04-15 | Bulgaria | Easter Sunday |
| 1990-04-15 | Bolivia | Tarija Day |
| 1990-04-15 | Canada | Easter Sunday |
| 1990-04-15 | Switzerland | Easter Sunday |
| 1990-04-15 | Chile | Easter Sunday |
| 1990-04-15 | Colombia | Easter Sunday |
| 1990-04-15 | Cyprus | Easter Sunday |
| 1990-04-15 | Denmark | Easter Sunday |
| 1990-04-15 | Estonia | Easter Sunday |
| 1990-04-15 | Eritrea | Orthodox Easter |
| 1990-04-15 | Ethiopia | Easter Sunday |
| 1990-04-15 | Finland | Easter Sunday |
| 1990-04-15 | Faroe Islands | Easter Sunday |
| 1990-04-15 | Georgia | Easter Sunday |
| 1990-04-15 | Greenland | Easter Sunday |
| 1990-04-15 | Greece | Easter Sunday |
| 1990-04-15 | Hong Kong | Easter Sunday |
| 1990-04-15 |  Croatia | Easter Sunday |
| 1990-04-15 | Haiti | Easter Sunday |
| 1990-04-15 |  Hungary | Easter Sunday |
| 1990-04-15 |  Ireland | Easter Sunday |
| 1990-04-15 | Iceland | Easter Sunday |
| 1990-04-15 |  Italia | Easter Sunday |
| 1990-04-15 | Kenya | Easter Sunday |
| 1990-04-15 |  Lithuania | Easter Sunday |
| 1990-04-15 | Latvia | Easter Sunday |
| 1990-04-15 |  Moldova | Easter Sunday |
| 1990-04-15 | Montenegro | Easter Sunday |
| 1990-04-15 |  Madagascar | Easter Sunday |
| 1990-04-15 |  Macedonia | Orthodox Easter |
| 1990-04-15 | Malaysia | Declaration of Malacca City as Historical City |
| 1990-04-15 |  Netherlands | Easter Sunday |
| 1990-04-15 | Norway | Easter Sunday |
| 1990-04-15 | Peru | Easter Sunday |
| 1990-04-15 | Philippines | Easter Sunday |
| 1990-04-15 |  Poland | Easter Sunday |
| 1990-04-15 | Portugal | Easter Sunday |
| 1990-04-15 | Romania | Easter Sunday |
| 1990-04-15 | Serbia | Orthodox Easter |
| 1990-04-15 | Seychelles | Easter Sunday |
| 1990-04-15 |  Sudan | Coptic Easter |
| 1990-04-15 |  Slovenia | Easter Sunday |
| 1990-04-15 | Svalbard & Jan Mayen | Easter Sunday |
| 1990-04-15 | San Marino | Easter Sunday |
| 1990-04-15 | Sint Maarten | Easter Sunday |
| 1990-04-15 | Thailand | Songkran Festival |
| 1990-04-15 | Trinidad & Tobago | Easter Sunday |
| 1990-04-15 |  Ukraine | Orthodox Easter |
| 1990-04-15 | Uganda | Easter Sunday |
| 1990-04-15 | Venezuela | Easter Sunday |
| 1990-04-15 | Kosovo | Easter Sunday |
| 1990-04-15 | Kosovo | Orthodox Easter |
| 1990-04-15 | Laos | Lao New Year's Day |
| 1990-04-15 | Papua New Guinea | Easter Sunday |
| 1990-04-16 | Andorra | Easter Monday |
| 1990-04-16 | Antigua & Barbuda | Easter Monday |
| 1990-04-16 | Anguilla | Easter Monday |
| 1990-04-16 | Albania | Catholic Easter |
| 1990-04-16 | Albania | Orthodox Easter |
| 1990-04-16 | Austria | Easter Monday |
| 1990-04-16 | Australia | Easter Monday |
| 1990-04-16 | Aruba | Easter Monday |
| 1990-04-16 | Åland Islands | Easter Monday |
| 1990-04-16 | Bosnia and Herzegovina | Easter Monday |
| 1990-04-16 | Barbados | Easter Monday |
| 1990-04-16 |  Belgium | Easter Monday |
| 1990-04-16 | Burkina Faso | Easter Monday |
| 1990-04-16 | Bulgaria | Easter Monday |
| 1990-04-16 |  Benin | Easter Monday |
| 1990-04-16 |  St. Barths | Easter Monday |
| 1990-04-16 | Bolivia | Tarija Day (substitutes) |
| 1990-04-16 | Caribbean Netherlands | Easter Monday |
| 1990-04-16 | Bahamas | Easter Monday |
| 1990-04-16 | Botswana | Easter Monday |
| 1990-04-16 | Belize | Easter Monday |
| 1990-04-16 | Canada | Easter Monday |
| 1990-04-16 | Cocos (Keeling) Islands | Easter Monday |
| 1990-04-16 |  Central African Republic | Easter Monday |
| 1990-04-16 |  Republic of the Congo | Easter Monday |
| 1990-04-16 | Switzerland | Easter Monday |
| 1990-04-16 |  Republic of Côte d'Ivoire | Easter Monday |
| 1990-04-16 | Cook Islands | Easter Monday |
| 1990-04-16 | Curaçao | Easter Monday |
| 1990-04-16 | Cyprus | Easter Monday |
| 1990-04-16 | Czech Republic | Easter Monday |
| 1990-04-16 | Germany | Easter Monday |
| 1990-04-16 | Denmark | Easter Monday |
| 1990-04-16 | Dominica | Easter Monday |
| 1990-04-16 |  Egypt | Sham El Nessim |
| 1990-04-16 | Spain | Easter Monday |
| 1990-04-16 | Finland | Easter Monday |
| 1990-04-16 | Fiji | Easter Monday |
| 1990-04-16 | Faroe Islands | Easter Monday |
| 1990-04-16 |  France | Easter Monday |
| 1990-04-16 |  Gabon | Easter Monday |
| 1990-04-16 | United Kingdom | Easter Monday |
| 1990-04-16 | Grenada | Easter Monday |
| 1990-04-16 | Georgia | Easter Monday |
| 1990-04-16 |  French Guiana | Easter Monday |
| 1990-04-16 | Guernsey | Easter Monday |
| 1990-04-16 | Ghana | Easter Monday |
| 1990-04-16 | Gibraltar | Easter Monday |
| 1990-04-16 | Greenland | Easter Monday |
| 1990-04-16 | The Gambia | Easter Monday |
| 1990-04-16 | Guinea | Easter Monday |
| 1990-04-16 | Guadeloupe | Easter Monday |
| 1990-04-16 | Greece | Easter Monday |
| 1990-04-16 | Guyana | Easter Monday |
| 1990-04-16 | Hong Kong | Easter Monday |
| 1990-04-16 | Croatia | Easter Monday |
| 1990-04-16 | Hungary | Easter Monday |
| 1990-04-16 | Ireland | Easter Monday |
| 1990-04-16 | Isle of Man | Easter Monday |
| 1990-04-16 | Iceland | Easter Monday |
| 1990-04-16 | Italia | Easter Monday |
| 1990-04-16 | Jersey | Easter Monday |
| 1990-04-16 | Jamaica | Easter Monday |
| 1990-04-16 | Kenya | Easter Monday |
| 1990-04-16 | St. Kitts & Nevis | Easter Monday |
| 1990-04-16 | Cayman Islands | Easter Monday |
| 1990-04-16 | St. Lucia | Easter Monday |
| 1990-04-16 | Lichtenstein | Easter Monday |
| 1990-04-16 | Lesotho | Easter Monday |
| 1990-04-16 | Lithuania | Easter Monday |
| 1990-04-16 |  Luxembourg | Easter Monday |
| 1990-04-16 | Latvia | Easter Monday |
| 1990-04-16 |  Monaco | Easter Monday |
| 1990-04-16 | Moldova | Easter Monday |
| 1990-04-16 | Montenegro | Easter Sunday |
| 1990-04-16 |  St. Martin | Easter Monday |
| 1990-04-16 | Madagascar | Easter Monday |
| 1990-04-16 | Macedonia | Orthodox Easter Monday |
| 1990-04-16 |  Republic of Mali | Easter Monday |
| 1990-04-16 | Martinique | Easter Monday |
| 1990-04-16 | Montserrat | Easter Monday |
| 1990-04-16 | Malawi | Easter Monday |
| 1990-04-16 | Namibia | Easter Monday |
| 1990-04-16 |  New Caledonia | Easter Monday |
| 1990-04-16 |  Republic of the Niger | Easter Monday |
| 1990-04-16 | Nigeria | Easter Monday |
| 1990-04-16 | Netherlands | Easter Monday |
| 1990-04-16 | Norway | Easter Monday |
| 1990-04-16 | New Zealand | Easter Monday |
| 1990-04-16 | Poland | Easter Monday |
| 1990-04-16 |  St. Pierre & Miquelon | Easter Monday |
| 1990-04-16 |  Puerto Rico | Birthday of José de Diego |
| 1990-04-16 |  Réunion | Easter Monday |
| 1990-04-16 | Romania | Easter Monday |
| 1990-04-16 | Serbia | Orthodox Easter Monday |
| 1990-04-16 | Rwanda | Easter Monday |
| 1990-04-16 | Seychelles | Easter Monday |
| 1990-04-16 | Sweden | Easter Monday |
| 1990-04-16 | St. Helena | Easter Monday |
| 1990-04-16 | St. Helena | Queen's Birthday |
| 1990-04-16 | Slovenia | Easter Monday |
| 1990-04-16 | Svalbard & Jan Mayen | Easter Monday |
| 1990-04-16 | Slovakia | Easter Monday |
| 1990-04-16 | Sierra Leone | Easter Monday |
| 1990-04-16 | San Marino | Easter Monday |
| 1990-04-16 | Senegal | Easter Monday |
| 1990-04-16 | Suriname | Easter Monday |
| 1990-04-16 | Sint Maarten | Easter Monday |
| 1990-04-16 | Swaziland | Easter Monday |
| 1990-04-16 | Turks & Caicos Islands | Easter Monday |
| 1990-04-16 |  Chad | Easter Monday |
| 1990-04-16 |  Togolese Republic | Easter Monday |
| 1990-04-16 | Tonga | Easter Monday |
| 1990-04-16 | Tanzania | Easter Monday |
| 1990-04-16 | Ukraine | Orthodox Easter |
| 1990-04-16 | Uganda | Easter Monday |
| 1990-04-16 | United States of America | Emancipation Day (DC) |
| 1990-04-16 | United States of America | Patriots' Day (MA) |
| 1990-04-16 |  Vatican City | Easter Monday |
| 1990-04-16 | St. Vincent & Grenadines | Easter Monday |
| 1990-04-16 | British Virgin Islands | Easter Monday |
| 1990-04-16 | U.S. Virgin Islands | Easter Monday |
| 1990-04-16 | Vanuatu | Easter Monday |
| 1990-04-16 |  Mayotte | Easter Monday |
| 1990-04-16 | South Africa | Family Day |
| 1990-04-16 | Zambia | Easter Monday |
| 1990-04-16 | Zimbabwe | Easter Monday |
| 1990-04-16 | Laos | Lao New Year's Day |
| 1990-04-16 | Papua New Guinea | Easter Monday |
| 1990-04-16 | Israel | Mimouna, Seventh day of Passover |
| 1990-04-16 | Iran | Martyrdom of Imam Ali |
| 1990-04-17 |  American Samoa | American Samoa Flag Day |
| 1990-04-17 | Gabon | Women's Day |
| 1990-04-17 | New Zealand | Provincial anniversary day |
| 1990-04-18 | Zimbabwe | Independence Day |
| 1990-04-18 | The Gambia | Lailat al-Qadr |
| 1990-04-19 | Iceland | First Day of Summer |
| 1990-04-19 | Swaziland | Birthday of King Mswati III |
| 1990-04-19 | Venezuela | Declaration of Independence |
| 1990-04-21 | Brazil | Tiradentes' Day |
| 1990-04-21 | Brazil | Fundação de Brasília (DF) |
| 1990-04-21 | Brazil | Data magna do estado (MG) |
| 1990-04-22 | Republic of Côte d'Ivoire | Laylat al-Qadr |
| 1990-04-22 | Guinea | Laylat al-Qadr |
| 1990-04-22 | Republic of the Niger | Laylat al-Qadr |
| 1990-04-23 | Spain | Día de Aragón (AR) |
| 1990-04-23 | Spain | Fiesta de Castilla y León (CL) |
| 1990-04-23 | Moldova | Memorial Day |
| 1990-04-23 |  Turkey | National Sovereignty and Children's Day |
| 1990-04-23 | United States of America | Confederate Memorial Day |
| 1990-04-24 |  Armenia | Mother's Day |
| 1990-04-24 |  Belarus | Commemoration Day |
| 1990-04-24 | Faroe Islands | Flag Day |
| 1990-04-24 | Republic of the Niger | Concord Day |
| 1990-04-25 | Australia | Anzac Day |
| 1990-04-25 | Cocos (Keeling) Islands | Anzac Day |
| 1990-04-25 | Cook Islands | Anzac Day |
| 1990-04-25 | Christmas Island | Anzac Day |
| 1990-04-25 | Egypt | Sinai Liberation Day |
| 1990-04-25 | Italia | Liberation Day |
| 1990-04-25 | New Zealand | ANZAC Day |
| 1990-04-25 | Portugal | Liberty Day |
| 1990-04-25 | Swaziland | National Flag Day |
| 1990-04-25 | Tonga | ANZAC Day |
| 1990-04-26 | Malaysia | Sultan of Terengganu's Birthday (11) |
| 1990-04-26 | Tanzania | Union Day |
| 1990-04-26 |  Jordan | Eid al-Fitr (estimated) |
| 1990-04-26 |  Kuwait | Eid al-Fitr (estimated) |
| 1990-04-26 |  Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1990-04-26 |  United Arab Emirates | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Albania | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Azerbaijan | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Bosnia and Herzegovina | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | People's Republic of Bangladesh | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Burkina Faso | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Bahrain | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Burundi | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Benin | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Brunei | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Cocos (Keeling) Islands | Hari Raya Puasa |
| 1990-04-26 | Central African Republic | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Republic of Côte d'Ivoire | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Cameroon | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Christmas Island | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Djibouti | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Algeria | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Egypt | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Western Sahara | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Eritrea | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Spain | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Ethiopia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Gabon | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Ghana | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | The Gambia | Korité |
| 1990-04-26 | Guinea | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Guinea-Bissau | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Indonesia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Iran | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Kenya | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Comoros | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Libya | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Kingdom of Morocco | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Montenegro | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Madagascar | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Macedonia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Republic of Mali | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Mauritania | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Malawi | Eid al Fitri |
| 1990-04-26 | Malaysia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Republic of the Niger | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Nigeria | Id el Fitr |
| 1990-04-26 | Philippines | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Rwanda | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Sudan | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Singapore | Hari Raya Puasa |
| 1990-04-26 | Sierra Leone | Korité |
| 1990-04-26 | Senegal | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 |  Somalia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Suriname | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Chad | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Tunisia | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Turkey | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Trinidad & Tobago | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Tanzania | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Uganda | End of Ramadan (Eid al-Fitr) |
| 1990-04-26 | Kosovo | End of Ramadan (Eid al-Fitr) |
| 1990-04-27 | Aruba | Kings Day |
| 1990-04-27 | Caribbean Netherlands | Kings Day |
| 1990-04-27 | Curaçao | Kings Day |
| 1990-04-27 | France | Abolition of Slavery |
| 1990-04-27 | Slovenia | Day of Uprising Against Occupation |
| 1990-04-27 | Sierra Leone | Independence Day |
| 1990-04-27 | Sint Maarten | King's Day |
| 1990-04-27 | Togolese Republic | Independence Day |
| 1990-04-27 | United States of America | Arbor Day |
| 1990-04-27 | Mayotte | Abolition of Slavery |
| 1990-04-27 | South Africa | Freedom Day |
| 1990-04-27 | Jordan | Eid al-Fitr Holiday (estimated) |
| 1990-04-27 | Kuwait | Eid al-Fitr Holiday (estimated) |
| 1990-04-27 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1990-04-27 | Azerbaijan | End of Ramadan (Eid al-Fitr) |
| 1990-04-27 | Indonesia | End of Ramadan (Eid al-Fitr) |
| 1990-04-27 | Iran | Holyday for Fetr Eeid |
| 1990-04-27 | Malaysia | End of Ramadan (Eid al-Fitr) |
| 1990-04-27 |  South Sudan | End of Ramadan (Eid al-Fitr) |
| 1990-04-27 | Togolese Republic | End of Ramadan (Eid al-Fitr) |
| 1990-04-28 | Barbados | National Heroes Day |
| 1990-04-28 | Gibraltar | Workers Memorial Day |
| 1990-04-28 | Jordan | Eid al-Fitr Holiday (estimated) |
| 1990-04-28 | Kuwait | Eid al-Fitr Holiday (estimated) |
| 1990-04-28 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1990-04-29 |  Japan | Greenery Day |
| 1990-04-29 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1990-04-30 | Argentina | Bridge Day |
| 1990-04-30 | Caribbean Netherlands | Rincon Day |
| 1990-04-30 | Dominican Republic | Labour Day |
| 1990-04-30 | Japan | Greenery Day (substitute day) |
| 1990-04-30 | Netherlands | Queen's Day |
| 1990-04-30 | Sint Maarten | Carnival |
| 1990-04-30 | United States of America | Confederate Memorial Day |
| 1990-04-30 | Vietnam | Day of liberating the South for national reunification |
| 1990-04-30 | Saudi Arabia | Eid al-Fitr Holiday (observed, estimated) |
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