16 Dec 1920 The keel of light carrier Hosho was laid down.

13 Nov 1921 Light carrier Hosho was launched.

27 Dec 1922 Light carrier Hosho was commissioned into service.

6 Jun 1924 Light carrier Hosho entered Yokosuka Naval Arsenal, Japan for post-commissioning modification work.

20 Aug 1924 Light carrier Hosho's modification work was completed at Yokosuka Naval Arsenal, Japan, which saw the removal of her island, mast, and crane.

15 Nov 1924 Light carrier Hosho was transferred out of the 1st Fleet.

10 Mar 1925 Light carrier Hosho was taken out of service to be fitted with a hydraulically-operated crash barrier.

2 Jul 1925 The installation of a hydraulically-operated crash barrier was completed on light carrier Hosho.

1 Apr 1928 Light carrier Hosho was assigned to Carrier Division 1.

1 Feb 1932 Light carrier Hosho arrived off the mouth of the Yangtze River in China.

5 Feb 1932 Light carrier Hosho launched aircraft to attack Shanghai, China.

7 Feb 1932 Light carrier Hosho launched aircraft to support ground troops at Shanghai, China.

23 Feb 1932 Light carrier Hosho launched aircraft to attack airfields near Hangzhou, China.

26 Feb 1932 Light carrier Hosho launched aircraft to attack airfields near Suzhou, China. Hosho-based fighters claimed 2 kills on this date.

23 Sep 1935 Light carrier Hosho's flight was damaged in a typhoon while participating in the annual Combined Fleet Maneuver exercise.

22 Nov 1935 Light carrier Hosho was taken out of service to repair typhoon damage and to receive enhancements.

31 Mar 1936 Light carrier Hosho completed her repairs.

16 Jul 1937 Light carrier Hosho arrived off Shanghai, China and began launching aircraft to support the invasion.

25 Jul 1937 Light carrier Hosho's aircraft shot down a Chinese B-10 bobmer near Shanghai, China.

1 Sep 1937 Light carrier Hosho departed Shanghai, China.

5 Sep 1937 Hosho departed Sasebo, Japan.

21 Sep 1937 Light carrier Hosho arrived off Guangzhou, Guangdong, China and launched aircraft to attack Tienho and Paiyun airfields, claiming 6 kills. 5 of the fighters launched ran out of fuel and were lost in the sea; all crew members were rescued.

3 Oct 1937 Light carrier Hosho arrived off Shanghai, China.

17 Oct 1937 Light carrier Hosho transferred all of her aircraft to carrier Ryujo and departed Chinese waters.

1 Dec 1937 Light carrier Hosho was placed in reserve.

12 Aug 1939 Light carrier Hosho was designated a training carrier.

11 Jan 1940 Captain Tomozo Kikuchi was named the commanding officer of light carrier Hosho.

23 Dec 1940 Light carrier Hosho was deemed not suitable for modern carrier aircraft

12 Aug 1941 Light carrier Hosho became the flagship of Carrier Division 3.

5 Sep 1941 Captain Karou Umetani was named the commanding officer of light carrier Hosho; Hosho was relieved the duty of being Carrier Division 3's flagship.

17 Sep 1941 Light carrier Hosho departed Hashirajima, Japan and arrived at Kure, Japan later on the same day.

28 Sep 1941 Light carrier Hosho became the temporary flagship of Carrier Division 3.

29 Sep 1941 Light carrier Hosho was relieved the duty of being Carrier Division 3's temporary flagship.

7 Dec 1941 Light carrier Hosho departed the Inland Sea, Japan with a large fleet.

8 Dec 1941 Light carrier Hosho passed through the Bungo Strait between Kyushu and Shikoku, Japan.

10 Dec 1941 Captain Karou Umetani of light carrier Hosho received a US submarine sighting report and decided to launch aircraft to hunt for the submarine even though the late launch meant he would have to turn on the flight deck lights after dark when the aircraft returned. No hostile submarines made use of the flight deck lights to attack the carrier, but the landing operations caused Hosho to be separated from the fleet.

11 Dec 1941 Light carrier Hosho rejoined the fleet; in the previous night, she fell out of formation as she slowed to conduct a night time landing operation.

12 Dec 1941 Light carrier Hosho detected a hostile submarine near Okinoshma Lighthouse in Japan. Later in the day, she arrived at Kure, Japan.

1 Apr 1942 Light carrier Hosho was assigned to the 1st Air Fleet.

20 May 1942 Light carrier Hosho was assigned toe the Main Body Air Force of the 1st Fleet.

29 May 1942 Light carrier Hosho departed Hashirajima, Japan for the Midway invasion.

2 Jun 1942 Light carrier Hosho launched aircraft to search for light cruiser Sendai and destroyer Isonami which had fallen out of formation due to heavy fog.

3 Jun 1942 Light carrier Hosho sailed ahead of the Southern Force into the Midway area.

4 Jun 1942 Light carrier Hosho's aircraft located the burning wreck of carrier Hiryu off Midway Atoll.

14 Jun 1942 Light carrier Hosho arrived at Hashirajima, Japan.

20 Jun 1942 Light carrier Hosho was assigned to the 1st Air Fleet; she disembarked all her aircraft.

14 Jul 1942 Light carrier Hosho was assigned to the 3rd Fleet.

1 Aug 1942 Captain Bunjiro Yamaguchi was assigned the commanding officer of light carrier Hosho.

14 Aug 1942 Light carrier Hosho was assigned to the Mobile Force Stand By Force.

20 Oct 1942 Light carrier Hosho was assigned to the Mobile Force Training Force.

15 Nov 1942 Captain Katsuji Hattori was named the commanding officer of light carrier Hosho.

15 Jan 1943 Light carrier Hosho was assigned to the 3rd Force of the Mobile Force Training Force.

5 Jul 1943 Captain Takeo Taizuka was named the commanding officer of light carrier Hosho.

18 Dec 1943 Captain Yoshi Matsuura was named the commanding officer of light carrier Hosho.

1 Jan 1944 Light carrier Hosho was assigned to Training Force of the 5th Force.

2 Feb 1944 Light carrier Hosho was assigned to the Combined Fleet as a training carrier.

1 Mar 1944 Captain Kiyoshi Koda was named the commanding officer of light carrier Hosho.

6 Jul 1944 Captain Yujiro Takarada was named the commanding officer of light carrier Hosho.

3 Jan 1945 Light carrier Hosho conducted a training exercise at Kure, Japan.

20 Jan 1945 Light carrier Hosho conducted a torpedo attack training with Air Group 453 and submarine HA-106.

1 Feb 1945 Light carrier Hosho arrived at Tokuyama, Japan, refueled, and departed to conduct a training exercise as a target vessel.

5 Mar 1945 Captain Hidekazu Osuga was named the commanding officer of light carrier Hosho.

9 Mar 1945 Light carrier Hosho conducted torpedo evasion exercise; five of the torpedoes used were live.

11 Mar 1945 Light carrier Hosho departed Oita, Japan for target ship duty for Air Group 252's training.

19 Mar 1945 Light carrier Hosho was attacked by 7 US aircraft off Kure, Japan at 0532 hours, receiving three hits, which caused minor damage and killed six.

23 Mar 1945 Light carrier Hosho was assigned to the 2nd Fleet.

18 May 1945 Captain Keiji Furutani was named the commanding officer of light carrier Hosho.

28 May 1945 Light carrier Hosho was camouflaged at Nishinomishima, Japan.

1 Jun 1945 Light carrier Hosho was assigned to the habor defense force at Kure, Japan as a reserve ship, which meant her crew was reduced to half the standard complement size.

14 Jul 1945 Light carrier Hosho received orders to transit the Shimonoseki Strait for Moji, Japan, but the order was repeatedly delayed due to US air attacks.

23 Jul 1945 Light carrier Hosho began preparations to depart Kure, Japan for Moji, Japan.

24 Jul 1945 Light carrier Hosho was hit by a bomb or a rocket during an attack by US aircraft at Kure, Japan; the damage was minor.

26 Jul 1945 Light carrier Hosho departed Kure, Japan for Moji, Japan.

20 Sep 1945 Captain Kunizo Kaneoka was named the commanding officer of light carrier Hosho.

5 Oct 1945 Light carrier Hosho was removed from the Japanese Navy List. On the same day, she departed Kure, Japan for the Marshall Islands in an effort to repatriot Japanese military servicemen.

16 Oct 1945 Light carrier Hosho arrived at Wotje, Marshall Islands and embarked 700 Japanese military servicemen. She departed for Eniwetok, Marshall Islands later on the same day.

3 Nov 1945 Light carrier Hosho arrived at Uraga, Japan and disembarked 1,011 Japanese military servicemen returned from the Marshall Islands.

5 Dec 1945 Light carrier Hosho entered the drydocks at Hidachi Innoshima shipyard in Japan to receive repairs and to remove the forward portions of the flight deck to improve visibility from the bridge.

5 Jan 1946 Light carrier Hosho departed Kure, Japan for Wewak, New Guinea.

16 Aug 1946 Light carrier Hosho was struck from the list of Japanese vessels used to repatriot overseas servicemen.

31 Aug 1946 Light carrier Hosho was transferred to the Home Ministry for deactivation.

2 Sep 1946 Light carrier Hosho began to be broken up for scraps by Hitachi Zosen, Sakurajima, Japan.