Use the Formula Functions

Functions	Description
IF	Determines if expressions are true or false. Returns a given value if true and another value if false.
ISNUMBER	Determines if a text value is a number and returns True if it is. Otherwise, it returns False.
ABS	Calculates the absolute value of a number. The absolute value of a number is the number without its positive or negative sign.
MAX	Returns the highest number from a list of numbers.
MIN	Returns the lowest number from a list of numbers.
NOW	Returns the current date and time in Date/Time data type.
TODAY	Returns the current date as a date data type.
DATEVALUE	Returns a date value for a date/time.
DATETIMEVALUE	Returns a year, month, day and time value in the GMT timezone.
CONTAINS	Compares two arguments of text and returns True if the first argument contains the second argument. If not, returns False.
STRARTSWITH	Determines the value or text to start with.
ENDSWITH	Determines the value or text to end with.
ISPICKVAL	Determines if the value of a picklist field is equal to a text literal you specify.
INCLUDES	Determines if the value of a picklist field is equal to a text literal you specify.
HYPERLINK	Creates a link to a URL specified that is linkable from the text specified.
TEXT	Returns the text value of a literal. Example: TEXT(picklist) returns the text value of the selected item in the picklist field.
VALUE	Returns the decimal value of a literal. Example: VALUE(“3.6”) returns the decimal value 3.6