Week Numbers 1666 in Costa Rica
Number of weeks in 1666 year is 53 weeks
Weeks are according Costa Rica calendar rules, Sunday first day and weeks are Sunday to Saturday
| Week # | From Date | To Date | Weeks from Now |
|---|---|---|---|
| Week 1 | December 27, 1665 | January 2, 1666 | passed 18726 weeks ago |
| Week 2 | January 3, 1666 | January 9, 1666 | passed 18725 weeks ago |
| Week 3 | January 10, 1666 | January 16, 1666 | passed 18724 weeks ago |
| Week 4 | January 17, 1666 | January 23, 1666 | passed 18723 weeks ago |
| Week 5 | January 24, 1666 | January 30, 1666 | passed 18722 weeks ago |
| Week 6 | January 31, 1666 | February 6, 1666 | passed 18721 weeks ago |
| Week 7 | February 7, 1666 | February 13, 1666 | passed 18720 weeks ago |
| Week 8 | February 14, 1666 | February 20, 1666 | passed 18719 weeks ago |
| Week 9 | February 21, 1666 | February 27, 1666 | passed 18718 weeks ago |
| Week 10 | February 28, 1666 | March 6, 1666 | passed 18717 weeks ago |
| Week 11 | March 7, 1666 | March 13, 1666 | passed 18716 weeks ago |
| Week 12 | March 14, 1666 | March 20, 1666 | passed 18715 weeks ago |
| Week 13 | March 21, 1666 | March 27, 1666 | passed 18714 weeks ago |
| Week 14 | March 28, 1666 | April 3, 1666 | passed 18713 weeks ago |
| Week 15 | April 4, 1666 | April 10, 1666 | passed 18712 weeks ago |
| Week 16 | April 11, 1666 | April 17, 1666 | passed 18711 weeks ago |
| Week 17 | April 18, 1666 | April 24, 1666 | passed 18710 weeks ago |
| Week 18 | April 25, 1666 | May 1, 1666 | passed 18709 weeks ago |
| Week 19 | May 2, 1666 | May 8, 1666 | passed 18708 weeks ago |
| Week 20 | May 9, 1666 | May 15, 1666 | passed 18707 weeks ago |
| Week 21 | May 16, 1666 | May 22, 1666 | passed 18706 weeks ago |
| Week 22 | May 23, 1666 | May 29, 1666 | passed 18705 weeks ago |
| Week 23 | May 30, 1666 | June 5, 1666 | passed 18704 weeks ago |
| Week 24 | June 6, 1666 | June 12, 1666 | passed 18703 weeks ago |
| Week 25 | June 13, 1666 | June 19, 1666 | passed 18702 weeks ago |
| Week 26 | June 20, 1666 | June 26, 1666 | passed 18701 weeks ago |
| Week 27 | June 27, 1666 | July 3, 1666 | passed 18700 weeks ago |
| Week 28 | July 4, 1666 | July 10, 1666 | passed 18699 weeks ago |
| Week 29 | July 11, 1666 | July 17, 1666 | passed 18698 weeks ago |
| Week 30 | July 18, 1666 | July 24, 1666 | passed 18697 weeks ago |
| Week 31 | July 25, 1666 | July 31, 1666 | passed 18696 weeks ago |
| Week 32 | August 1, 1666 | August 7, 1666 | passed 18695 weeks ago |
| Week 33 | August 8, 1666 | August 14, 1666 | passed 18694 weeks ago |
| Week 34 | August 15, 1666 | August 21, 1666 | passed 18693 weeks ago |
| Week 35 | August 22, 1666 | August 28, 1666 | passed 18692 weeks ago |
| Week 36 | August 29, 1666 | September 4, 1666 | passed 18691 weeks ago |
| Week 37 | September 5, 1666 | September 11, 1666 | passed 18690 weeks ago |
| Week 38 | September 12, 1666 | September 18, 1666 | passed 18689 weeks ago |
| Week 39 | September 19, 1666 | September 25, 1666 | passed 18688 weeks ago |
| Week 40 | September 26, 1666 | October 2, 1666 | passed 18687 weeks ago |
| Week 41 | October 3, 1666 | October 9, 1666 | passed 18686 weeks ago |
| Week 42 | October 10, 1666 | October 16, 1666 | passed 18685 weeks ago |
| Week 43 | October 17, 1666 | October 23, 1666 | passed 18684 weeks ago |
| Week 44 | October 24, 1666 | October 30, 1666 | passed 18683 weeks ago |
| Week 45 | October 31, 1666 | November 6, 1666 | passed 18682 weeks ago |
| Week 46 | November 7, 1666 | November 13, 1666 | passed 18681 weeks ago |
| Week 47 | November 14, 1666 | November 20, 1666 | passed 18680 weeks ago |
| Week 48 | November 21, 1666 | November 27, 1666 | passed 18679 weeks ago |
| Week 49 | November 28, 1666 | December 4, 1666 | passed 18678 weeks ago |
| Week 50 | December 5, 1666 | December 11, 1666 | passed 18677 weeks ago |
| Week 51 | December 12, 1666 | December 18, 1666 | passed 18676 weeks ago |
| Week 52 | December 19, 1666 | December 25, 1666 | passed 18675 weeks ago |
| Week 53 | December 26, 1666 | January 1, 1667 | passed 18674 weeks ago |