Returns the given value converted to a logical value. TOLOGICAL (1) TOLOGICAL (1) returns TRUE.

When the sole parameter is a logical value, it is returned unchanged. When it is a number, 0 is converted to FALSE and all other values are converted to TRUE. When it is a temporal value, the temporal value denoted by the serial number 0 is converted to FALSE and all other temporal values are converted to TRUE. When it is a color, a fully-opaque black color is converted to FALSE and all other values are converted to TRUE. Text strings with a length of zero are converted to FALSE, and all other text strings are converted to TRUE.

This function is not commonly supported by spreadsheets.