ISO Week Numbers 1980

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All 52 ISO weeks in 1980. Week 1 is the first week with at least four days in January; weeks run Monday through Sunday.

1979 Week Number Calculator1981
WeekISO codeYYWWWeek startsWeek ends
11980-W018001Monday, December 31, 1979Sunday, January 6, 1980
21980-W028002Monday, January 7, 1980Sunday, January 13, 1980
31980-W038003Monday, January 14, 1980Sunday, January 20, 1980
41980-W048004Monday, January 21, 1980Sunday, January 27, 1980
51980-W058005Monday, January 28, 1980Sunday, February 3, 1980
61980-W068006Monday, February 4, 1980Sunday, February 10, 1980
71980-W078007Monday, February 11, 1980Sunday, February 17, 1980
81980-W088008Monday, February 18, 1980Sunday, February 24, 1980
91980-W098009Monday, February 25, 1980Sunday, March 2, 1980
101980-W108010Monday, March 3, 1980Sunday, March 9, 1980
111980-W118011Monday, March 10, 1980Sunday, March 16, 1980
121980-W128012Monday, March 17, 1980Sunday, March 23, 1980
131980-W138013Monday, March 24, 1980Sunday, March 30, 1980
141980-W148014Monday, March 31, 1980Sunday, April 6, 1980
151980-W158015Monday, April 7, 1980Sunday, April 13, 1980
161980-W168016Monday, April 14, 1980Sunday, April 20, 1980
171980-W178017Monday, April 21, 1980Sunday, April 27, 1980
181980-W188018Monday, April 28, 1980Sunday, May 4, 1980
191980-W198019Monday, May 5, 1980Sunday, May 11, 1980
201980-W208020Monday, May 12, 1980Sunday, May 18, 1980
211980-W218021Monday, May 19, 1980Sunday, May 25, 1980
221980-W228022Monday, May 26, 1980Sunday, June 1, 1980
231980-W238023Monday, June 2, 1980Sunday, June 8, 1980
241980-W248024Monday, June 9, 1980Sunday, June 15, 1980
251980-W258025Monday, June 16, 1980Sunday, June 22, 1980
261980-W268026Monday, June 23, 1980Sunday, June 29, 1980
271980-W278027Monday, June 30, 1980Sunday, July 6, 1980
281980-W288028Monday, July 7, 1980Sunday, July 13, 1980
291980-W298029Monday, July 14, 1980Sunday, July 20, 1980
301980-W308030Monday, July 21, 1980Sunday, July 27, 1980
311980-W318031Monday, July 28, 1980Sunday, August 3, 1980
321980-W328032Monday, August 4, 1980Sunday, August 10, 1980
331980-W338033Monday, August 11, 1980Sunday, August 17, 1980
341980-W348034Monday, August 18, 1980Sunday, August 24, 1980
351980-W358035Monday, August 25, 1980Sunday, August 31, 1980
361980-W368036Monday, September 1, 1980Sunday, September 7, 1980
371980-W378037Monday, September 8, 1980Sunday, September 14, 1980
381980-W388038Monday, September 15, 1980Sunday, September 21, 1980
391980-W398039Monday, September 22, 1980Sunday, September 28, 1980
401980-W408040Monday, September 29, 1980Sunday, October 5, 1980
411980-W418041Monday, October 6, 1980Sunday, October 12, 1980
421980-W428042Monday, October 13, 1980Sunday, October 19, 1980
431980-W438043Monday, October 20, 1980Sunday, October 26, 1980
441980-W448044Monday, October 27, 1980Sunday, November 2, 1980
451980-W458045Monday, November 3, 1980Sunday, November 9, 1980
461980-W468046Monday, November 10, 1980Sunday, November 16, 1980
471980-W478047Monday, November 17, 1980Sunday, November 23, 1980
481980-W488048Monday, November 24, 1980Sunday, November 30, 1980
491980-W498049Monday, December 1, 1980Sunday, December 7, 1980
501980-W508050Monday, December 8, 1980Sunday, December 14, 1980
511980-W518051Monday, December 15, 1980Sunday, December 21, 1980
521980-W528052Monday, December 22, 1980Sunday, December 28, 1980

ISO weeks start on Monday. Week 1 is the first week with at least four days in the new year.