Ah right. FM Classic seems to be different. It is 25 June. Spain is 10 July. Basically the same as FM11 and older.
I just made a list (During dinner because I needed a break from FM, hahah) for the normal FM career regen dates and it is slightly different to last year; feel free to post it, it'd get better noticed if it's by you and if it helps people, that's good enough for me
26.01(Jan) - Anguilla, Antigua & Barbuda, Aruba, Barbados, Bermuda, British Virgin Islands, Cayman Islands, Costa Rica, Cuba, Curaçao, Dominica, Dominican Rep., El Salvador, Grenada, Guatemala, Guyana, Honduras, Jamaica, Montserrat, Nicaragua, Panama, Puerto Rico, Saint Kitts & Nevis, Saint Lucia, St Vincent & the Grenadines, Surinam, Trinidad & Tobago, Turks & Caicos Islands, US Virgin Islands
23.02(Feb) - Albania, American Samoa, Andorra, Armenia, Azerbaijan, Bosnia & Herzegovina, Cyprus, Estonia, Faroe Islands, Fiji, FYR Macedonia, Georgia, Kazakhstan, Kiribati, Latvia, Lithuania, Luxembourg, Malta, Moldova, Montenegro, New Zealand, Papua New Guinea, Samoa, San Marino, Solomon Islands, Tonga, Vanuatu
08.03(Mar) - Croatia, France, Germany, Greece, Hungary, Israel, N. Ireland, Russia, Scotland, Switzerland, Turkey, Ukraine, Wales
13.03(Mar) - Austria, England
17.03(Mar) - Slovakia
18.03(Mar) - Belgium, Czech Republic, Demark, Italy, Poland, Portugal,
19.03(Mar) - Bulgaria, Romania, Slovenia, Uruguay
23.03(Mar) - Mexico
25.03(Mar) - Holland
28.03(Mar) - Serbia, Spain
02.04(Apr) - Argentina, India, South Africa
17.04(Apr) - Indonesia
19.04(Apr) - Hong Kong
27.04(Apr) - Australia
07.06(Jun) - Bolivia, Ecuador, Paraguay, Venezuela
13.08(Aug) - Iceland
27.08(Aug) - Afghanistan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Chinese Taipei, East Timor, Guam, Iran, Iraq, Japan, Jordan, Kuwait, Kyrgyzstan, Laos, Lebanon, Macau, Maldives, Mongolia, Myanmar, Nepal, North Korea, Northern Mariana, Oman, Pakistan, Palestine, Philippines, Qatar, Saudi Arabia, Sri Lanka, Syria, Tajikistan, Thailand, Turkmenistan, U.A.E., Uzbekistan, Vietnam, Yemen
02.09(Sep) - Malaysia, Sweden
14.09(Sep) - South Korea
19.09(Sep) - Chile
20.09(Sep) - Brazil, Ireland
25.09(Sep) - Finland
28.09(Sep) - Singapore, Colombia
01.10(Oct) - Norway
03.10(Oct) - Algeria, Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Cape Verde, Central African Rep., Chad, Congo, Djibouti, DR Congo, Egypt, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Kenya, Lesotho, Liberia, Libya, Madagascar, Malawi, Mali, Mauritania, Mauritius, Morocco, Mozambique, Namibia, Niger, Nigeria, Rwanda, São Tomé & Príncipe, Senegal, Seychelles, Sierra Leone, Somalia, South Sudan, Sudan, Swaziland, Tanzania, Togo, Tunisia, Uganda, Zambia, Zanzibar, Zimbabwe
08.10(Oct) - China
16.10(Oct) - Peru
02.11(Nov) - Belarus
26.12(Dec) - USA
The ranked nations that don't feature on this list are: Bahamas, Belize, Canada, Comoros, Cook Islands, Haiti, Liechtenstein, New Caledonia, Tahiti, Tuvalu. They don't appear to ever get any regens.