Using EndNote and Harvard / Author-Date style
EndNote comes with style files for Harvard style (Harvard.ens), and for Author Date style (Author-Date.ens).
However, other style files might conform better with your expectations of author-date style. (EndNote's version of Harvard style will format journal article references without journal article titles, for instance.)
An AGPS* style file is available for download here. This file will generate in-text notes and bibliography entries as per the Author-Date style illustrated in the Style manual for authors, editors and printers, 6th edition, Milton, Qld.: John Wiley & Sons, 2002.
* Note: AGPS stands for Australian Government Printing Service, which until recently was the publisher of this widely-used style manual.
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