ISO Week Numbers 1999

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All 52 ISO weeks in 1999. Week 1 is the first week with at least four days in January; weeks run Monday through Sunday.

1998 Week Number Calculator2000
WeekISO codeYYWWWeek startsWeek ends
11999-W019901Monday, January 4, 1999Sunday, January 10, 1999
21999-W029902Monday, January 11, 1999Sunday, January 17, 1999
31999-W039903Monday, January 18, 1999Sunday, January 24, 1999
41999-W049904Monday, January 25, 1999Sunday, January 31, 1999
51999-W059905Monday, February 1, 1999Sunday, February 7, 1999
61999-W069906Monday, February 8, 1999Sunday, February 14, 1999
71999-W079907Monday, February 15, 1999Sunday, February 21, 1999
81999-W089908Monday, February 22, 1999Sunday, February 28, 1999
91999-W099909Monday, March 1, 1999Sunday, March 7, 1999
101999-W109910Monday, March 8, 1999Sunday, March 14, 1999
111999-W119911Monday, March 15, 1999Sunday, March 21, 1999
121999-W129912Monday, March 22, 1999Sunday, March 28, 1999
131999-W139913Monday, March 29, 1999Sunday, April 4, 1999
141999-W149914Monday, April 5, 1999Sunday, April 11, 1999
151999-W159915Monday, April 12, 1999Sunday, April 18, 1999
161999-W169916Monday, April 19, 1999Sunday, April 25, 1999
171999-W179917Monday, April 26, 1999Sunday, May 2, 1999
181999-W189918Monday, May 3, 1999Sunday, May 9, 1999
191999-W199919Monday, May 10, 1999Sunday, May 16, 1999
201999-W209920Monday, May 17, 1999Sunday, May 23, 1999
211999-W219921Monday, May 24, 1999Sunday, May 30, 1999
221999-W229922Monday, May 31, 1999Sunday, June 6, 1999
231999-W239923Monday, June 7, 1999Sunday, June 13, 1999
241999-W249924Monday, June 14, 1999Sunday, June 20, 1999
251999-W259925Monday, June 21, 1999Sunday, June 27, 1999
261999-W269926Monday, June 28, 1999Sunday, July 4, 1999
271999-W279927Monday, July 5, 1999Sunday, July 11, 1999
281999-W289928Monday, July 12, 1999Sunday, July 18, 1999
291999-W299929Monday, July 19, 1999Sunday, July 25, 1999
301999-W309930Monday, July 26, 1999Sunday, August 1, 1999
311999-W319931Monday, August 2, 1999Sunday, August 8, 1999
321999-W329932Monday, August 9, 1999Sunday, August 15, 1999
331999-W339933Monday, August 16, 1999Sunday, August 22, 1999
341999-W349934Monday, August 23, 1999Sunday, August 29, 1999
351999-W359935Monday, August 30, 1999Sunday, September 5, 1999
361999-W369936Monday, September 6, 1999Sunday, September 12, 1999
371999-W379937Monday, September 13, 1999Sunday, September 19, 1999
381999-W389938Monday, September 20, 1999Sunday, September 26, 1999
391999-W399939Monday, September 27, 1999Sunday, October 3, 1999
401999-W409940Monday, October 4, 1999Sunday, October 10, 1999
411999-W419941Monday, October 11, 1999Sunday, October 17, 1999
421999-W429942Monday, October 18, 1999Sunday, October 24, 1999
431999-W439943Monday, October 25, 1999Sunday, October 31, 1999
441999-W449944Monday, November 1, 1999Sunday, November 7, 1999
451999-W459945Monday, November 8, 1999Sunday, November 14, 1999
461999-W469946Monday, November 15, 1999Sunday, November 21, 1999
471999-W479947Monday, November 22, 1999Sunday, November 28, 1999
481999-W489948Monday, November 29, 1999Sunday, December 5, 1999
491999-W499949Monday, December 6, 1999Sunday, December 12, 1999
501999-W509950Monday, December 13, 1999Sunday, December 19, 1999
511999-W519951Monday, December 20, 1999Sunday, December 26, 1999
521999-W529952Monday, December 27, 1999Sunday, January 2, 2000

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