| 21.05.1938: | Commissioned, after that training and trials. | 
| Aug - Nov 1938: | Battle training in the North Atlantic. | 
| 16.05.1939: | Gneisenau
 becomes flagship of the Kriegsmarine. | 
| 07-09.10.1939: | Raid to intercept Britain - Scandinavia trade together with CL Köln
 and destroyers Wilhelm Heidkamp
, Friedrich Ihn
, Diether von Roeder
, Karl Galster
, Max Schulz
, Paul Jakobi
, Bernd von Arnim
, Erich Steinbrinck
 and Friedrich Eckoldt
. No results.
 | 
| 21.11.1939: | Together with Scharnhorst
, the Gneisenau
 is sent south of Iceland to attack the Northern Patrol. | 
| 23.11.1939: | The two battlecruisers sink the British auxiliary cruiser Rawalpindi
. | 
| 26.11.1939: | Gneisenau
 suffered severe sea damage during a heavy storm in the Shetland-Bergen Narrows. | 
| 27.11.1939: | Returns to Kiel. | 
| 04.02.1940: | Repairs completed, ship transfers to Wilhelmshaven. | 
| 18-20.02.1940: | Operation "Nordmark": Scharnhorst
, Gneisenau
, CA Admiral Hipper 
 and the destroyers Wolfgang Zenker
, Wilhelm Heidkamp
 and Karl Galster
 are sent to intercept British convoys between Bergen and England, but no ships are
 sighted.
 | 
| 07-12.04.1940: | Operation "Weserübung": Flagship of the fleet commander Vice-Admiral Lütjens. Battle with British BC Renown
 and cruiser Birmingham
 west of the Lofoten, Gneisenau
 was hit once.
 | 
| 12.04.1940: | Returns to Wilhelmshaven. | 
| 07.05.1940: | On its way from Wilhelmshaven to the Baltic Sea, the Gneisenau
 is hit by a mine. | 
| 04-10.06.1940: | Operation "Juno": Flagship in the Polar Sea operations together with Scharnhorst
, Admiral Hipper
 and the destroyers Karl Galster
, Hans Lody
, Erich Steinbrinck
 and Hermann Schoemann
.
 | 
| 08.06.1940: | Battle with British CV Glorious
 and the DDs Ardent
 and Acasta
. All British ships are sunk. | 
| 10.06.1940: | Returns to Drontheim. | 
| 10-12.06.1940: | Sailed into the Polar Sea with Admiral Hipper
. Operations canceled, ships return to Drontheim again. | 
| 20.06.1940: | Leaves Drontheim with Admiral Hipper
 again for operations between Iceland, the Faroers and Orkney. 40 nautical miles north-west of the island of Halten, Gneisenau
 is hit by a torpedo of the British submarine Clyde
. Emergency repairs at Drontheim.
 | 
| 25.07.1940: | Escorted by CL Nürnberg
, the Gneisenau
 leaves Drontheim to return to Kiel. | 
| 28.07.1940: | Arrives at Kiel. | 
| Jul - Dec 1940: | In dock. | 
| 28.12.1940-02.01.1941: | Abandoned attempt to break out into the North Atlantic together with Scharnhorst
. Gneisenau
 suffered storm damage. | 
| 22.01.1941: | Operation "Berlin": Second successful attempt to break out into the North Atlantic together with sister ship Scharnhorst
.
 | 
| 04.02.1941: | Reached southern Greenland. | 
| 08.02.1941: | Unsuccessful attack on convoy HX-108 after the sighting of the BB Ramiles
. | 
| 22.02.1941: | Scharnhorst
 and Gneisenau
 sink four merchants east of Newfoundland. | 
| 07-09.03.1941: | Attack on convoy SL-67 is broken off as the British BB Malaya
 is sighted. Two U-boats are ordered to attack the convoy and sink 5 merchants. | 
| 15-16.03.1941: | Scharnhorst
 and Gneisenau
 sink 16 merchants east of Newfoundland. Gneisenau
 is sighted by the British BB Rodney
 which requests identification of the German ship. Gneisenau
 replies "H.M.S. Emerald
" and escapes. | 
| 22.03.1941: | Both ships enter Brest. They sunk a total of 22 ships with 115600t, Gneisenau
 14 with 66300 t. | 
| 06.04.1941: | Hit by aircraft torpedo, put into dock. | 
| 11-11.04.1941: | The ship is hit by four bombs during British bomber attacks on Brest. | 
| 11-13.02.1942: | Operation "Ceberus": Break through the English Channel: Scharnhorst
, Gneisenau
 and CA Prinz Eugen
, escorted by 6 destroyers (Paul Jakobi
, Richard Beitzen
, Friedrich Ihn
, Hermann Schoemann
, Z25
, Z29
) and 14 torpedo boats (e.g. Kondor
, Jaguar
, T12
, T13
), return to Germany. Gneisenau
 is hit by a mine on the Brunsbüttel Roads on its way to Kiel.
 | 
| 26-27.02.1942: | In the night ot the 26th to 27th, Gneisenau
 is hit by a large bomb during an air attack. The complete bow section burns out and takes the ship out of action. | 
| 04.04.1942: | Sent to Gotenhafen (Gdynia) to be decommissioned and reconstructed. | 
| 01.07.1943: | Withdrawn from service. The 28 cm (11") triple turrets should be replaced with 38 cm (15") twin turrets. | 
| 1943: | After the sinking of the Scharnhorst
, conversion work is stopped. | 
| 27-28.03.1945: | Sunk as a blockade ship in Gotenhafen (Gdynia). | 
| 1947-1951: | Broken up and scrapped. |