ISO Week Numbers 1991

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All 52 ISO weeks in 1991. Week 1 is the first week with at least four days in January; weeks run Monday through Sunday.

1990 Week Number Calculator1992
WeekISO codeYYWWWeek startsWeek ends
11991-W019101Monday, December 31, 1990Sunday, January 6, 1991
21991-W029102Monday, January 7, 1991Sunday, January 13, 1991
31991-W039103Monday, January 14, 1991Sunday, January 20, 1991
41991-W049104Monday, January 21, 1991Sunday, January 27, 1991
51991-W059105Monday, January 28, 1991Sunday, February 3, 1991
61991-W069106Monday, February 4, 1991Sunday, February 10, 1991
71991-W079107Monday, February 11, 1991Sunday, February 17, 1991
81991-W089108Monday, February 18, 1991Sunday, February 24, 1991
91991-W099109Monday, February 25, 1991Sunday, March 3, 1991
101991-W109110Monday, March 4, 1991Sunday, March 10, 1991
111991-W119111Monday, March 11, 1991Sunday, March 17, 1991
121991-W129112Monday, March 18, 1991Sunday, March 24, 1991
131991-W139113Monday, March 25, 1991Sunday, March 31, 1991
141991-W149114Monday, April 1, 1991Sunday, April 7, 1991
151991-W159115Monday, April 8, 1991Sunday, April 14, 1991
161991-W169116Monday, April 15, 1991Sunday, April 21, 1991
171991-W179117Monday, April 22, 1991Sunday, April 28, 1991
181991-W189118Monday, April 29, 1991Sunday, May 5, 1991
191991-W199119Monday, May 6, 1991Sunday, May 12, 1991
201991-W209120Monday, May 13, 1991Sunday, May 19, 1991
211991-W219121Monday, May 20, 1991Sunday, May 26, 1991
221991-W229122Monday, May 27, 1991Sunday, June 2, 1991
231991-W239123Monday, June 3, 1991Sunday, June 9, 1991
241991-W249124Monday, June 10, 1991Sunday, June 16, 1991
251991-W259125Monday, June 17, 1991Sunday, June 23, 1991
261991-W269126Monday, June 24, 1991Sunday, June 30, 1991
271991-W279127Monday, July 1, 1991Sunday, July 7, 1991
281991-W289128Monday, July 8, 1991Sunday, July 14, 1991
291991-W299129Monday, July 15, 1991Sunday, July 21, 1991
301991-W309130Monday, July 22, 1991Sunday, July 28, 1991
311991-W319131Monday, July 29, 1991Sunday, August 4, 1991
321991-W329132Monday, August 5, 1991Sunday, August 11, 1991
331991-W339133Monday, August 12, 1991Sunday, August 18, 1991
341991-W349134Monday, August 19, 1991Sunday, August 25, 1991
351991-W359135Monday, August 26, 1991Sunday, September 1, 1991
361991-W369136Monday, September 2, 1991Sunday, September 8, 1991
371991-W379137Monday, September 9, 1991Sunday, September 15, 1991
381991-W389138Monday, September 16, 1991Sunday, September 22, 1991
391991-W399139Monday, September 23, 1991Sunday, September 29, 1991
401991-W409140Monday, September 30, 1991Sunday, October 6, 1991
411991-W419141Monday, October 7, 1991Sunday, October 13, 1991
421991-W429142Monday, October 14, 1991Sunday, October 20, 1991
431991-W439143Monday, October 21, 1991Sunday, October 27, 1991
441991-W449144Monday, October 28, 1991Sunday, November 3, 1991
451991-W459145Monday, November 4, 1991Sunday, November 10, 1991
461991-W469146Monday, November 11, 1991Sunday, November 17, 1991
471991-W479147Monday, November 18, 1991Sunday, November 24, 1991
481991-W489148Monday, November 25, 1991Sunday, December 1, 1991
491991-W499149Monday, December 2, 1991Sunday, December 8, 1991
501991-W509150Monday, December 9, 1991Sunday, December 15, 1991
511991-W519151Monday, December 16, 1991Sunday, December 22, 1991
521991-W529152Monday, December 23, 1991Sunday, December 29, 1991

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