In APA style, the date refers to the date of publication. The date may take one of the following forms:
There are various guidelines for formatting the date. The main guidelines are listed below:
From APA Publication Manual, 7th, ed., Ch. 9.13 Definition of Date & 9.14 Format of the Date Element
Date for an article or book:
Burgess, R. (2019). Rethinking global health: Frameworks of power. Routledge.
Date for an article in a newspaper:
Hess, A. (2019, January 3). Cats who take direction. The New York Times, C1
No date:
Census Bureau. (n.d.). U.S. and world population clock. U.S. Department of Commerce. Retrieved January 9, 2020, from https://www.census.gov/popclock/