Chinese textbooks currently date the "Chinese People's War of Resistance Against Japanese Aggression" to July 7, 1937 and the Marco Polo Bridge Incident which heralded Japan's full-scale invasion.
But new guidelines call for all curriculum materials at schools and universities across the country to push back the start to the Mukden Incident of September 18, 1931, after which Tokyo's forces occupied Manchuria in northeastern China.
The initial years of Japanese regional occupation and the wider later struggle were "parts of the same whole", the ministry said, adding that the change was intended to "strengthen patriotic education".
Course materials must all "fully reflect how the Chinese Communist Party was a tower of strength during the war" and "highlight how the Chinese people were not afraid of ferocious adversity", the ministry said.
Speaking at a regular press briefing Wednesday, foreign ministry spokesperson Lu Kang said the change would help younger generations remember their past.
"I want to emphasise that to change this is not to carry forward hatred," he said.
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