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Manufacturing Calendar
It is a special calendar where annual operating days are designated in advance in each company or factory. Generally, as shown in the figure, manufacturing days are added as consecutive numbers in a form corresponding to a usual calendar's operating days.
In fact, this manufacturing calendar shows June 1st is the 230th manufacturing day, and June 1st is the 252nd manufacturing day. Employing consecutive numbers to express manufacturing days makes the calculation of the delivery date easier.
Reference:JIT Business Research Mr. Hirano Hiroyuki