{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-06T14:01:22.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-04-06T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":2639,"title":"How Many Months Until It's Today Again?","description":"Given a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\r\n\r\nStart with 22-Oct-2014, which is a Wednesday. How many months must pass before the 22nd of the month occurs on a Wednesday again? Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\r\n\r\n\r\n*Example*\r\n\r\n d_in = '22-Oct-2014'\r\n wait_in_months = 6\r\n\r\n*Feature Tip*\r\n\r\nThis problem is made simpler by the \u003chttp://www.mathworks.com/help/matlab/date-and-time-operations.html DATETIME objects\u003e found in MATLAB \u003chttps://www.mathworks.com/help/matlab/release-notes.html?rntext=\u0026startrelease=R2014b\u0026endrelease=R2014b\u0026groupby=release\u0026sortby=descending Release 2014b\u003e and later.\r\n\r\n\r\n\r\n","description_html":"\u003cp\u003eGiven a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\u003c/p\u003e\u003cp\u003eStart with 22-Oct-2014, which is a Wednesday. How many months must pass before the 22nd of the month occurs on a Wednesday again? Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre\u003e d_in = '22-Oct-2014'\r\n wait_in_months = 6\u003c/pre\u003e\u003cp\u003e\u003cb\u003eFeature Tip\u003c/b\u003e\u003c/p\u003e\u003cp\u003eThis problem is made simpler by the \u003ca href = \"http://www.mathworks.com/help/matlab/date-and-time-operations.html\"\u003eDATETIME objects\u003c/a\u003e found in MATLAB \u003ca href = \"https://www.mathworks.com/help/matlab/release-notes.html?rntext=\u0026startrelease=R2014b\u0026endrelease=R2014b\u0026groupby=release\u0026sortby=descending\"\u003eRelease 2014b\u003c/a\u003e and later.\u003c/p\u003e","function_template":"function wait_in_months = monthsUntilMatch(d_in)\r\n  wait_in_months = 0;\r\nend","test_suite":"%%\r\nd_in = '22-Oct-2014';\r\nm_correct = 6;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '2-Jul-2014';\r\nm_correct = 14;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '12-May-2011';\r\nm_correct = 8;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '14-Jul-1789';\r\nm_correct = 14;\r\nm_test    = monthsUntilMatch(d_in)\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '31-Dec-1999';\r\nm_correct = 3;\r\nm_test    = monthsUntilMatch(d_in)\r\nassert(isequal(m_test,m_correct))\r\n\r\n","published":true,"deleted":false,"likes_count":4,"comments_count":0,"created_by":7,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":131,"test_suite_updated_at":"2014-10-22T21:23:24.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2014-10-22T21:05:30.000Z","updated_at":"2026-01-05T00:04:16.000Z","published_at":"2014-10-22T21:23:24.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eStart with 22-Oct-2014, which is a Wednesday. How many months must pass before the 22nd of the month occurs on a Wednesday again? Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ d_in = '22-Oct-2014'\\n wait_in_months = 6]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eFeature Tip\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem is made simpler by the\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/date-and-time-operations.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eDATETIME objects\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e found in MATLAB\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/release-notes.html?rntext=\u0026amp;startrelease=R2014b\u0026amp;endrelease=R2014b\u0026amp;groupby=release\u0026amp;sortby=descending\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eRelease 2014b\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e and later.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":2639,"title":"How Many Months Until It's Today Again?","description":"Given a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\r\n\r\nStart with 22-Oct-2014, which is a Wednesday. How many months must pass before the 22nd of the month occurs on a Wednesday again? Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\r\n\r\n\r\n*Example*\r\n\r\n d_in = '22-Oct-2014'\r\n wait_in_months = 6\r\n\r\n*Feature Tip*\r\n\r\nThis problem is made simpler by the \u003chttp://www.mathworks.com/help/matlab/date-and-time-operations.html DATETIME objects\u003e found in MATLAB \u003chttps://www.mathworks.com/help/matlab/release-notes.html?rntext=\u0026startrelease=R2014b\u0026endrelease=R2014b\u0026groupby=release\u0026sortby=descending Release 2014b\u003e and later.\r\n\r\n\r\n\r\n","description_html":"\u003cp\u003eGiven a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\u003c/p\u003e\u003cp\u003eStart with 22-Oct-2014, which is a Wednesday. How many months must pass before the 22nd of the month occurs on a Wednesday again? Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre\u003e d_in = '22-Oct-2014'\r\n wait_in_months = 6\u003c/pre\u003e\u003cp\u003e\u003cb\u003eFeature Tip\u003c/b\u003e\u003c/p\u003e\u003cp\u003eThis problem is made simpler by the \u003ca href = \"http://www.mathworks.com/help/matlab/date-and-time-operations.html\"\u003eDATETIME objects\u003c/a\u003e found in MATLAB \u003ca href = \"https://www.mathworks.com/help/matlab/release-notes.html?rntext=\u0026startrelease=R2014b\u0026endrelease=R2014b\u0026groupby=release\u0026sortby=descending\"\u003eRelease 2014b\u003c/a\u003e and later.\u003c/p\u003e","function_template":"function wait_in_months = monthsUntilMatch(d_in)\r\n  wait_in_months = 0;\r\nend","test_suite":"%%\r\nd_in = '22-Oct-2014';\r\nm_correct = 6;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '2-Jul-2014';\r\nm_correct = 14;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '12-May-2011';\r\nm_correct = 8;\r\nm_test    = monthsUntilMatch(d_in);\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '14-Jul-1789';\r\nm_correct = 14;\r\nm_test    = monthsUntilMatch(d_in)\r\nassert(isequal(m_test,m_correct))\r\n\r\n%%\r\nd_in = '31-Dec-1999';\r\nm_correct = 3;\r\nm_test    = monthsUntilMatch(d_in)\r\nassert(isequal(m_test,m_correct))\r\n\r\n","published":true,"deleted":false,"likes_count":4,"comments_count":0,"created_by":7,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":131,"test_suite_updated_at":"2014-10-22T21:23:24.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2014-10-22T21:05:30.000Z","updated_at":"2026-01-05T00:04:16.000Z","published_at":"2014-10-22T21:23:24.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a particular date, calculate how many months must pass before that same day of the month occurs on the same day of the week.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eStart with 22-Oct-2014, which is a Wednesday. 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Answer: You have to wait for six months. 22-Apr-2015 is also a Wednesday.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ d_in = '22-Oct-2014'\\n wait_in_months = 6]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eFeature Tip\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem is made simpler by 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