{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","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":"2026-05-26T00:00:00.000Z","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":43612,"title":"time of day","description":"Calculate the time of day in days, hours, minutes or seconds passed since the beginning of the day, depending on the unit. The unit is given as a string: \r\n\r\n  validUnits = {'nanoseconds'; 'microseconds'; 'milliseconds'; ...\r\n  'seconds'; 'minutes'; 'hours'; 'days'};","description_html":"\u003cp\u003eCalculate the time of day in days, hours, minutes or seconds passed since the beginning of the day, depending on the unit. The unit is given as a string:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003evalidUnits = {'nanoseconds'; 'microseconds'; 'milliseconds'; ...\r\n'seconds'; 'minutes'; 'hours'; 'days'};\r\n\u003c/pre\u003e","function_template":"function y = timeOfDay(x, unit)\r\n  y = 1;\r\nend","test_suite":"%%\r\nx = '12-Jan-2000 00:06:16';\r\ny_correct = 376 * 1e9;\r\nunits = 'nanoseconds';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '12-Jan-2000 00:06:16';\r\ny_correct = 0.10444444;\r\nunits = 'hours';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '11-Nov-1911 11:11:11';\r\ny_correct = 40271;\r\nunits = 'seconds';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '11-Nov-1911 11:11:11';\r\ny_correct = 0.4660995;\r\nunits = 'days';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '24-Oct-2016 20:26:28';\r\ny_correct = [73588*1e9 73588*1e6 73588000 ...\r\n    73588 1226.4667 20.441111 0.85171296];\r\nunits = {'nanoseconds', 'microseconds', 'milliseconds',...\r\n    'seconds', 'minutes', 'hours', 'days'};\r\nfor i = 1:numel(y_correct)\r\n    assert(abs(timeOfDay(x, units{i}) - y_correct(i)) / y_correct(i) \u003c 1e-3)\r\nend\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":3,"created_by":57323,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":28,"test_suite_updated_at":"2016-12-06T18:54:26.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-24T19:04:23.000Z","updated_at":"2026-05-29T01:45:04.000Z","published_at":"2016-10-24T19:04:23.000Z","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\u003eCalculate the time of day in days, hours, minutes or seconds passed since the beginning of the day, depending on the unit. 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The unit is given as a string: \r\n\r\n  validUnits = {'nanoseconds'; 'microseconds'; 'milliseconds'; ...\r\n  'seconds'; 'minutes'; 'hours'; 'days'};","description_html":"\u003cp\u003eCalculate the time of day in days, hours, minutes or seconds passed since the beginning of the day, depending on the unit. The unit is given as a string:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003evalidUnits = {'nanoseconds'; 'microseconds'; 'milliseconds'; ...\r\n'seconds'; 'minutes'; 'hours'; 'days'};\r\n\u003c/pre\u003e","function_template":"function y = timeOfDay(x, unit)\r\n  y = 1;\r\nend","test_suite":"%%\r\nx = '12-Jan-2000 00:06:16';\r\ny_correct = 376 * 1e9;\r\nunits = 'nanoseconds';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '12-Jan-2000 00:06:16';\r\ny_correct = 0.10444444;\r\nunits = 'hours';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '11-Nov-1911 11:11:11';\r\ny_correct = 40271;\r\nunits = 'seconds';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '11-Nov-1911 11:11:11';\r\ny_correct = 0.4660995;\r\nunits = 'days';\r\nassert(abs(timeOfDay(x, units) - y_correct) / y_correct \u003c 1e-3)\r\n\r\n%%\r\nx = '24-Oct-2016 20:26:28';\r\ny_correct = [73588*1e9 73588*1e6 73588000 ...\r\n    73588 1226.4667 20.441111 0.85171296];\r\nunits = {'nanoseconds', 'microseconds', 'milliseconds',...\r\n    'seconds', 'minutes', 'hours', 'days'};\r\nfor i = 1:numel(y_correct)\r\n    assert(abs(timeOfDay(x, units{i}) - y_correct(i)) / y_correct(i) \u003c 1e-3)\r\nend\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":3,"created_by":57323,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":28,"test_suite_updated_at":"2016-12-06T18:54:26.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-24T19:04:23.000Z","updated_at":"2026-05-29T01:45:04.000Z","published_at":"2016-10-24T19:04:23.000Z","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\u003eCalculate the time of day in days, hours, minutes or seconds passed since the beginning of the day, depending on the unit. 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