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This function returns the month corresponding to the specified date value.
MONTH(date)
[Required] Specify the date argument as a number (as in 37806.5), a string (as in "7/4/2003 12:00"), or a DateTime object, as in DATE(2003,7,4).
The month is returned as an integer, ranging from 1 (January) to 12 (December).
MONTH(L4)
MONTH(R4C12)
MONTH(366) gives the result 12
MONTH("12/17/2004") gives the result 12