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DATE(year, month, day)
For example, the following formula will return the serial number for the date January 1, 2023:
=DATE(2023, 1, 1)
An absolute cell reference in Excel
An absolute cell reference in Excel is a cell reference that does not change when the formula is copied to another cell. This is done by adding a dollar sign ($) before the column letter and/or the row number. For example, $A$1 is an absolute reference to cell A1.
There are two types of absolute cell references:
Completely absolute: This is when both the column letter and the row number have a dollar sign. For example, $A$1 is a completely absolute reference.
Partially absolute: This is when only the column letter or the row number has a dollar sign. For example, A$1 is a partially absolute reference, where the column letter is fixed but the row number is relative.
Absolute cell references are useful when you want to make sure that a specific cell is always referenced in a formula, even when the formula is copied to other cells. For example, if you have a formula that calculates the total sales for each month, you would want to use an absolute cell reference for the cell that contains the total sales. This way, the formula will always reference the same cell, even when it is copied to other rows.