Question: What day was the general of the 6th army captured in Stalingrad

Context paragraphs:
62nd Army (Soviet Union): The 7th Reserve Army was formed 28 May 1942 as part of the Stavka Reserve (RVGK).  Within one month, this force had been redesignated the 62nd Army.  From mid August 1942 until late January 1943, the 62nd Army, under the command of General Vasily Chuikov, fought in the Battle of Stalingrad.  62nd Army conducted an epic defense of the city against repeated and desperate attacks by the German 6th Army.  The Army, along with the 64th Army, was operating under the Soviet Stalingrad Front.  After the German assault at Stalingrad had come to utter disaster, the 62nd Army was uniquely awarded the Order of Lenin, and granted Guards status as the 8th Guards Army.

Romanian armies in the Battle of Stalingrad: Two Romanian armies, the Third and the Fourth, were involved in the Battle of Stalingrad, helping to protect the northern and southern flanks respectively of the German 6th Army as it tried to conquer the city of Stalingrad, defended by the Soviet Red Army in mid to late 1942.  Overpowered and poorly equipped, these forces were unable to stop the Soviet November offensive which punched through both flanks and left the 6th Army encircled in Stalingrad.  The Romanians suffered enormous losses, which effectively ended their offensive capability on the Eastern Front for the remainder of the war.

Bombing of Stalingrad: Stalingrad, a Soviet city and industrial centre on the river Volga, was bombed heavily by the Luftwaffe during the Battle of Stalingrad in World War II.  German land forces comprising the 6th Army had advanced to the suburbs of Stalingrad by August 1942.  The city was extensively bombed as a precursor to the 6th Army's first major ground offensive against the city on by 16th Panzer Division on 23 August, breaking out from its bridgehead on the River Don north-west of the city. `

Operation Fischreiher: Operation Fischreiher (German for heron) was an extension to Operation Blue II during the German invasion of the Soviet Union in World War II.  General Friedrich Paulus' 6th Army, and part of the 4th Panzer Army under General Hermann Hoth, was to advance across the Don river towards the city of Stalingrad on the Western bend of the Volga river.

6th Army (Wehrmacht): The 6th Army was a field army unit of the German Wehrmacht during World War II.  The 6th Army is still widely remembered for its destruction by the Red Army at the Battle of Stalingrad in the winter of 1942/43.  It is also infamous for the war crimes (such as the massacre of more than 30,000 Jews at Babi Yar) it committed under the command of Field Marshal Walther von Reichenau during Operation Barbarossa in 1941.

Tatsinskaya Raid: The Tatsinskaya Raid was a Soviet armoured raid deep into the German rear conducted by 24th Tank Corps under the command of Major General Vasily Mikhaylovich Badanov in late December 1942, during the last phases of the Battle of Stalingrad (Operation Little Saturn).  It was designed to force the Germans to divert forces attempting to relieve the 6th Army trapped in Stalingrad.  The Soviet force captured its objective, the Luftwaffe's airfield at Tatsinskaya, destroying over 72 aircraft on the ground, but was left cut off and without supplies.  Despite the loss of most of the tank corps during the ensuing breakout, the raid was a great operational victory.

48th Army (Soviet Union): The 48th Army was a field army of the Soviet Red Army, active from 1941 to 1945.  The army was first formed in August 1941 and fought in the Leningrad Strategic Defensive Operation.  The army suffered heavy losses and was disbanded in early September.  Its remnants were moved to the 54th Army.  Reformed in April 1942 on the Bryansk Front, the army fought in the Maloarkhangelsk Offensive in the winter of 1943.  It was sent to the Central Front in March and defended the northern face of the Kursk Bulge.  During the summer, it fought in Operation Kutuzov and the Chernigov-Pripyat Offensive.  From November, the army fought in the Gomel-Rechitsa Offensive.  The army fought in Operation Bagration from June 1944.  During the offensive, the army captured Zhlobin and Bobruisk and was on the Narew by early September.  During early 1945, the army fought in the East Prussian Offensive and ended the war in East Prussia during May.  The army was transferred to Poland in July 1945 and its headquarters was used to form the Kazan Military District in September.

67th Army (Soviet Union): The 67th Army was a field army of the Soviet Union's Red Army.  The 67th Army was formed in October 1942 on the Leningrad Front from the Neva Operational Group.  It defended the right bank of the Neva River, holding the Nevsky Pyatachok and covering the Road of Life.  In January 1943 the army fought in Operation Iskra.  In late December, the army was combined with 55th Army.  The 67th Army headquarters was disbanded and 55th Army headquarters was renamed 67th Army headquarters.  Between January and March 1944 67th Army fought in the Leningrad–Novgorod Offensive, in which it captured Mga and Luga.  In April the army became part of the 3rd Baltic Front and fought in the Pskov-Ostrov Offensive in July and the Tartu Offensive in August and September.  The army fought in the Riga Offensive in September and October.  The army then fought to eliminate the Courland Pocket.  After the end of the war the army was disbanded during the summer of 1945.

66th Army (Soviet Union): The 66th Army was a field army of the Red Army.  It was established in August 1942 from the 8th Reserve Army.  The 66th Army fought to break through to the Volga to the north of Stalingrad during September and October 1942.  During Operation Uranus, the Soviet encirclement of German troops in Stalingrad, 66th Army troops linked up with those of the 62nd Army, forming the inner encirclement.  Until February the army fought to destroy the pocket and then was held in reserve.  In May 1943 it became the 5th Guards Army for its actions during the Battle of Stalingrad.

Friedrich Paulus: Soviet troops took Paulus by surprise and captured him in Stalingrad on 31 January 1943, the same day on which he was informed of his promotion to field marshal ("Generalfeldmarschall") by Adolf Hitler.

Supporting paragraphs: Operation Fischreiher Friedrich Paulus
Answer: 31 January 1943