2021

Timeline

(Based on the Military Calendar) 150,000 BCE 100,300 BCE 100,043 BCE 100,000 BCE 57,448 BCE 2200 BCE 2100 BCE 938 BCE 876 BCE 852 BCE 784 BCE 648 BCE 480 BCE 1112 1342 1552 1945 1995 1997 Real-world events 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2021 2079 2080 2142 2160 2162 2163 2164 2170 2178 2215 2218 2220 2291 2310 2313 2317 2318 2321 2332 2349 2356 2362 2390 2396 2397 2401 2412 2429 2437 2459 2460s 2460 2461 2462 2468 2469 2470s 2470 2473 2478 2479 2480s 2481 2484 2485 2488 2489 2490s 2490 2491 2492 2494 2495 2496 2497 2498 2499 2500s 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510s 2510 2511 2512 2513 2514 2515 2516 2517 2519 2520s 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530s 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540s 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550s 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2567 2573 2581 2589 2607 2610

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Halo universe

• The International Society of Civil Engineers is established on Earth.

Real world

June

The Halo Infinite multiplayer is first revealed.

July

The first Halo Infinite tech preview releases.

September

The second Halo Infinite tech preview releases.

November

Halo Infinite surprise releases on the 15th to celebrate Halo's 20th anniversary.

Fracture: Tenrai Week 1 happens.

December

Halo Infinite fully releases.

The Winter Contingency event starts.