ISO Week Numbers 1981

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All 53 ISO weeks in 1981. Week 1 is the first week with at least four days in January; weeks run Monday through Sunday.

1980 Week Number Calculator1982
WeekISO codeYYWWWeek startsWeek ends
11981-W018101Monday, December 29, 1980Sunday, January 4, 1981
21981-W028102Monday, January 5, 1981Sunday, January 11, 1981
31981-W038103Monday, January 12, 1981Sunday, January 18, 1981
41981-W048104Monday, January 19, 1981Sunday, January 25, 1981
51981-W058105Monday, January 26, 1981Sunday, February 1, 1981
61981-W068106Monday, February 2, 1981Sunday, February 8, 1981
71981-W078107Monday, February 9, 1981Sunday, February 15, 1981
81981-W088108Monday, February 16, 1981Sunday, February 22, 1981
91981-W098109Monday, February 23, 1981Sunday, March 1, 1981
101981-W108110Monday, March 2, 1981Sunday, March 8, 1981
111981-W118111Monday, March 9, 1981Sunday, March 15, 1981
121981-W128112Monday, March 16, 1981Sunday, March 22, 1981
131981-W138113Monday, March 23, 1981Sunday, March 29, 1981
141981-W148114Monday, March 30, 1981Sunday, April 5, 1981
151981-W158115Monday, April 6, 1981Sunday, April 12, 1981
161981-W168116Monday, April 13, 1981Sunday, April 19, 1981
171981-W178117Monday, April 20, 1981Sunday, April 26, 1981
181981-W188118Monday, April 27, 1981Sunday, May 3, 1981
191981-W198119Monday, May 4, 1981Sunday, May 10, 1981
201981-W208120Monday, May 11, 1981Sunday, May 17, 1981
211981-W218121Monday, May 18, 1981Sunday, May 24, 1981
221981-W228122Monday, May 25, 1981Sunday, May 31, 1981
231981-W238123Monday, June 1, 1981Sunday, June 7, 1981
241981-W248124Monday, June 8, 1981Sunday, June 14, 1981
251981-W258125Monday, June 15, 1981Sunday, June 21, 1981
261981-W268126Monday, June 22, 1981Sunday, June 28, 1981
271981-W278127Monday, June 29, 1981Sunday, July 5, 1981
281981-W288128Monday, July 6, 1981Sunday, July 12, 1981
291981-W298129Monday, July 13, 1981Sunday, July 19, 1981
301981-W308130Monday, July 20, 1981Sunday, July 26, 1981
311981-W318131Monday, July 27, 1981Sunday, August 2, 1981
321981-W328132Monday, August 3, 1981Sunday, August 9, 1981
331981-W338133Monday, August 10, 1981Sunday, August 16, 1981
341981-W348134Monday, August 17, 1981Sunday, August 23, 1981
351981-W358135Monday, August 24, 1981Sunday, August 30, 1981
361981-W368136Monday, August 31, 1981Sunday, September 6, 1981
371981-W378137Monday, September 7, 1981Sunday, September 13, 1981
381981-W388138Monday, September 14, 1981Sunday, September 20, 1981
391981-W398139Monday, September 21, 1981Sunday, September 27, 1981
401981-W408140Monday, September 28, 1981Sunday, October 4, 1981
411981-W418141Monday, October 5, 1981Sunday, October 11, 1981
421981-W428142Monday, October 12, 1981Sunday, October 18, 1981
431981-W438143Monday, October 19, 1981Sunday, October 25, 1981
441981-W448144Monday, October 26, 1981Sunday, November 1, 1981
451981-W458145Monday, November 2, 1981Sunday, November 8, 1981
461981-W468146Monday, November 9, 1981Sunday, November 15, 1981
471981-W478147Monday, November 16, 1981Sunday, November 22, 1981
481981-W488148Monday, November 23, 1981Sunday, November 29, 1981
491981-W498149Monday, November 30, 1981Sunday, December 6, 1981
501981-W508150Monday, December 7, 1981Sunday, December 13, 1981
511981-W518151Monday, December 14, 1981Sunday, December 20, 1981
521981-W528152Monday, December 21, 1981Sunday, December 27, 1981
531981-W538153Monday, December 28, 1981Sunday, January 3, 1982

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