Calculations based on a date can be done in Excel worksheets including sums and differences. The data can be passed as a parameter in the date format to the SUMIF operator. The current date or a specific date can be passed to the SUMIF operator along with the cell references in Excel office software. Calculations based on a date can simplify the management of data in worksheets which might otherwise have to be done by complicated methods such as writing programs or macros. The support for date data format in the Excel worksheet is a very useful feature of the office software.