NReturns the argument provided as a number.
value – The argument to be converted to a number.
If value is TRUE, N returns 1.
If value is a number, the number is returned.
If value is a date or time, N returns a generated serial number, based on the number of days since December 30, 1899.
Negative values are interpreted as days before this date, and fractional values indicate time of day past midnight.
If value is FALSE or any value not listed above, N returns 0.
When using N on numeric values in other cells, formatting (into currencies, scientific notation, etc.) is lost. To specify formatting on the return value of N, simply apply the format desired to the cell containing the formula.
This function is, in fact, rarely necessary as Google Spreadsheet automatically converts between most formats appropriately. It is provided primarily for compatibility with formulas used in other spreadsheet packages.
TO_DATE: Converts a provided number to a date.
T: Returns string arguments as text.