Just recently went through this exercise:
4 Aug 1914 - War declared
21 Aug 1914 - Volunteers of the 103rd Calgary Rifles board the train out of town - 2 and a half weeks after war declared
22 Aug 1914 - 10th Bn CEF stood up at Valcartier with volunteers from 60th Rifles of Canada (Moose Jaw), 95th Sask Rifles (Regina), 90th Wpg Rifles and 99th Manitoba Rangers
31 Aug 1914 - 10th Bn CEF strength of 53 officers and 1528 other ranks - 4 weeks after war declared
31 Aug 1914 - Volunteers of the 103rd Calgary Rifles arrive at Valcartier to an empty field 9 days after boarding the train in Calgary
27 Sep 1914 - 10th Bn CEF receives uniforms - 8 weeks after war declared
29 Sep 1914 - 10th Bn CEF boards ships at Quebec
3 Oct 1914 - 10th Bn leaves Quebec in convoy
14 Oct 1914 - 10th Bn arrives in Plymouth, UK
20 Oct 1914 - 10th Bn on Salisbury Plain and training commences - 2 and a half months after war declared
10 Feb 1915 - 10th Bn sails for France - 6 months after war declared and 4 month after equipping, organizing (and re-org, and re-re-org, and re-re-re-org and re-re-re-re-org (4 or 8 companies))
22 Feb 1915 - 10th Bn baptism of fire as some troops shelled doing trench duties.
22 Apr 1915 - 10th Bn earns Oak Leaves at St Juliens Wood. - 8 months after war declared, 6 months after training commenced, 2 months after introduction to theatre and baptism of fire.
Then the learning started.... and continued for four years.