From Halopedia, the Halo wiki
c. 17,448B.C.E c. 7,448 B.C.E c. 1720 1945 2004 2160-2200 2160 2162 ? /12/2163 2164 2170 2291 2310 1/1/2362 2390 2490 2494 2496 2510 2511 2512 2513 2517 2519 2525 2531 2535 2536 2550 2552
Should be put on pages that are involved with time.