Journal Citation Reports is published annually in two editions:
JCR Science Edition contains data about more than 8,000 journals in science and technology.
JCR Social Sciences Edition contains data about more than 2,600 journals in the social sciences.
The year that you select is the JCR year. All of the data that you see for journals and subject categories come from journal data published in that year.
For example, if you select JCR Science Edition 2012, and you search for a particular journal, you will see the 2012 data for that journal, including:
- Number of articles published in the journal in 2012
- Number of citations to that journal from articles published in 2012
- Impact Factor calculated from 2012 data, and so on