Week Numbers 1981 in Costa Rica
Number of weeks in 1981 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 28, 1980 | January 3, 1981 | passed 2356 weeks ago |
| Week 2 | January 4, 1981 | January 10, 1981 | passed 2355 weeks ago |
| Week 3 | January 11, 1981 | January 17, 1981 | passed 2354 weeks ago |
| Week 4 | January 18, 1981 | January 24, 1981 | passed 2353 weeks ago |
| Week 5 | January 25, 1981 | January 31, 1981 | passed 2352 weeks ago |
| Week 6 | February 1, 1981 | February 7, 1981 | passed 2351 weeks ago |
| Week 7 | February 8, 1981 | February 14, 1981 | passed 2350 weeks ago |
| Week 8 | February 15, 1981 | February 21, 1981 | passed 2349 weeks ago |
| Week 9 | February 22, 1981 | February 28, 1981 | passed 2348 weeks ago |
| Week 10 | March 1, 1981 | March 7, 1981 | passed 2347 weeks ago |
| Week 11 | March 8, 1981 | March 14, 1981 | passed 2346 weeks ago |
| Week 12 | March 15, 1981 | March 21, 1981 | passed 2345 weeks ago |
| Week 13 | March 22, 1981 | March 28, 1981 | passed 2344 weeks ago |
| Week 14 | March 29, 1981 | April 4, 1981 | passed 2343 weeks ago |
| Week 15 | April 5, 1981 | April 11, 1981 | passed 2342 weeks ago |
| Week 16 | April 12, 1981 | April 18, 1981 | passed 2341 weeks ago |
| Week 17 | April 19, 1981 | April 25, 1981 | passed 2340 weeks ago |
| Week 18 | April 26, 1981 | May 2, 1981 | passed 2339 weeks ago |
| Week 19 | May 3, 1981 | May 9, 1981 | passed 2338 weeks ago |
| Week 20 | May 10, 1981 | May 16, 1981 | passed 2337 weeks ago |
| Week 21 | May 17, 1981 | May 23, 1981 | passed 2336 weeks ago |
| Week 22 | May 24, 1981 | May 30, 1981 | passed 2335 weeks ago |
| Week 23 | May 31, 1981 | June 6, 1981 | passed 2334 weeks ago |
| Week 24 | June 7, 1981 | June 13, 1981 | passed 2333 weeks ago |
| Week 25 | June 14, 1981 | June 20, 1981 | passed 2332 weeks ago |
| Week 26 | June 21, 1981 | June 27, 1981 | passed 2331 weeks ago |
| Week 27 | June 28, 1981 | July 4, 1981 | passed 2330 weeks ago |
| Week 28 | July 5, 1981 | July 11, 1981 | passed 2329 weeks ago |
| Week 29 | July 12, 1981 | July 18, 1981 | passed 2328 weeks ago |
| Week 30 | July 19, 1981 | July 25, 1981 | passed 2327 weeks ago |
| Week 31 | July 26, 1981 | August 1, 1981 | passed 2326 weeks ago |
| Week 32 | August 2, 1981 | August 8, 1981 | passed 2325 weeks ago |
| Week 33 | August 9, 1981 | August 15, 1981 | passed 2324 weeks ago |
| Week 34 | August 16, 1981 | August 22, 1981 | passed 2323 weeks ago |
| Week 35 | August 23, 1981 | August 29, 1981 | passed 2322 weeks ago |
| Week 36 | August 30, 1981 | September 5, 1981 | passed 2321 weeks ago |
| Week 37 | September 6, 1981 | September 12, 1981 | passed 2320 weeks ago |
| Week 38 | September 13, 1981 | September 19, 1981 | passed 2319 weeks ago |
| Week 39 | September 20, 1981 | September 26, 1981 | passed 2318 weeks ago |
| Week 40 | September 27, 1981 | October 3, 1981 | passed 2317 weeks ago |
| Week 41 | October 4, 1981 | October 10, 1981 | passed 2316 weeks ago |
| Week 42 | October 11, 1981 | October 17, 1981 | passed 2315 weeks ago |
| Week 43 | October 18, 1981 | October 24, 1981 | passed 2314 weeks ago |
| Week 44 | October 25, 1981 | October 31, 1981 | passed 2313 weeks ago |
| Week 45 | November 1, 1981 | November 7, 1981 | passed 2312 weeks ago |
| Week 46 | November 8, 1981 | November 14, 1981 | passed 2311 weeks ago |
| Week 47 | November 15, 1981 | November 21, 1981 | passed 2310 weeks ago |
| Week 48 | November 22, 1981 | November 28, 1981 | passed 2309 weeks ago |
| Week 49 | November 29, 1981 | December 5, 1981 | passed 2308 weeks ago |
| Week 50 | December 6, 1981 | December 12, 1981 | passed 2307 weeks ago |
| Week 51 | December 13, 1981 | December 19, 1981 | passed 2306 weeks ago |
| Week 52 | December 20, 1981 | December 26, 1981 | passed 2305 weeks ago |
| Week 53 | December 27, 1981 | January 2, 1982 | passed 2304 weeks ago |