100,000 B.C.E.
From Halopedia, the Halo Wiki
(Based on the Military Calendar)
100,300 B.C.E.
100,000 B.C.E.
57,448 B.C.E.
480 B.C.E.
1552
1775
1945
2004
2079
2142
2152
2160-2200
2160
2162
2163
2164
2170
2291
2310
2362
2390
2412
2461
2468
2469
2473
2490
2491
2492
2494
2495
2496
2502
2509
2510
2511
2512
2513
2516
2517
2519
2520
2523
2524
2525
2527
2528
2530
2531
2533
2535
2536
2537
2539
2540
2541
2542
2545
2546
2547
2548
2549
2550
2551
2552
2553
2555
2556
2567
2573
2581
2607
2610
The date 100,000 B.C.E. is the approximate time when The Forerunners fired the Halos[1], what the Covenant refer to as The Great Journey. The activation killed all sentient life in three radii of the galactic center including the Forerunners themselves. The date, 100,000 years ago, is around the time our Homo sapiens ancestors began migrating out of Africa. Also the time period when the Halo 3: The Cradle of Life mini comics takes place. These comics tell us that human beings saw something (the portal to the Ark) being built by "Gods" (Forerunner machines) in Africa.
