DATEDIF(start_date, end_date, unit)
DAYS(end_date, start_date)
DAYS360(start_date, end_date, [method])
EDATE(start_date, months)
EOMONTH(start_date, months)
NETWORKDAYS(start_date, end_date, [holidays])
NETWORKDAYS.INTL(start_date, end_date, ...)
TIME(hour, minute, second)
WEEKDAY(serial_number, [return_type])
WEEKNUM(serial_number, [return_type])
WORKDAY(start_date, days, [holidays])
WORKDAY.INTL(start_date, days, [weekend], [holidays])
YEARFRAC(start_date, end_date, [basis])