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This function returns the year as an integer for a specified date.
YEAR(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 widget correctly treats the year 1900 as a non-leap year and uses a base date of 12/31/1899.
YEAR(A2)
YEAR(R2C1)
YEAR(0.007) gives the result (which may be different from Excel) 1899
YEAR(DATE(2004,8,9)) gives the result 2004
YEAR(38208) gives the result 2004
YEAR("8/9/2004") gives the result 2004