Data expressions are used when defining calculated custom data fields in Workfront. They connect existing Workfront fields in statements that generate a new field.
Understanding Calculated Data Expressions
You can use calculated data expressions in the following areas of Workfront:
 In a custom form
For more information about creating calculated custom data fields on custom forms in Workfront, see "Using Calculated Custom Data."  In a calculated custom column in a report, or list, when you use text mode.
For more information about using text mode in reports and views, see "Understanding Text Mode."
There are a number of expression that can be used in calculated custom fields. The following list defines the available data expressions in Workfront:
Expression  Example  Explanation  Type 

ADDDAYS  ADDDAYS(date, number)  Add number of days to date  Date & Time 
ADDWEEKDAYS  ADDWEEKDAYS(date, number)  Add number of week days to a date 
Date & Time 
ADDMONTHS  ADDMONTHS(date, number)  Add number of months to date 
Date & Time 
ADDYEARS  ADDYEARS(date, number)  Add number of years to date  Date & Time 
CLEARTIME  CLEARTIME(date)  Clears the time portion of a date  Date & Time 
DATE  DATE(string)  Converts a string to a date  Date & Time 
DATEDIFF  DATEDIFF(date1, date2)  Returns the number of days between the two dates, taking into account the start and the end days of the period selected as well as the time stamps on those days. For example, if the start time of the start date is 3 PM, the start day will not be counted as a full day.  Date & Time 
DAYOFMONTH  DAYOFMONTH(date)  Returns the day of month for the given date as a number, between 1 and 31.  Date & Time 
DAYOFWEEK  DAYOFWEEK(date)  Returns the day of week for the given date as a number, between 1 (Sunday) and 7 (Saturday)  Date & Time 
DAYSINMONTH  DAYSINMONTH(date)  Returns the total days in the month of the given date as a number  Date & Time 
DAYSINSPLITWEEK  DAYSINSPLITWEEK(date)  Returns the total week days between the date and the end of the week, or the end of the month, which ever comes first  Date & Time 
DAYSINYEAR  DAYSINYEAR(date)  Returns the total days in the year of the given date as a number  Date & Time 
DMAX  DMAX(date1, date2[, ...])  Returns the latest date in the list  Date & Time 
DMIN  DMIN(date1, date2[, ...])  Returns the earliest date in the list  Date & Time 
HOUR  HOUR(date)  Returns the hour of the given date as a number between 0 and 23  Date & Time 
MINUTE  MINUTE(date)  Returns the minute of the given date as a number  Date & Time 
MONTH  MONTH(date)  Returns the month of the given date as a number  Date & Time 
SECOND  SECOND(date)  Returns the second of the given date as a number  Date & Time 
WEEKDAYDIFF  WEEKDAYDIFF(date1, date2)  Returns the number of week days between two dates, taking into account the start and the end days of the period selected as well as the time stamps on those days. For example, if the start time of the start date is 3 PM, the start day will not be counted as a full day.  Date & Time 
WORKMINUTESDIFF  WORKMINUTESDIFF(date1, date2)  Returns the number of scheduled minutes between the dates according to the default schedule  Date & Time 
YEAR  YEAR(date)  Returns the year of the given date a number  Date & Time 
ABS  ABS(number)  Returns the absolute value of the number  Mathematical 
AVERAGE  AVERAGE(number1, number2[, ...])  Returns the average of numbers  Mathematical 
CEIL  CEIL(number)  Rounds a number up to the nearest integer  Mathematical 
DIV  DIV(number1, number2[, ...])  Divides all the numbers in the order provided  Mathematical 
FLOOR  FLOOR(number)  Rounds a number down to the nearest integer  Mathematical 
LN  LN(number)  Returns natural logarithm value of the number  Mathematical 
LOG  LOG(number1, number2)  Returns logarithm value of number2 to the base number1  Mathematical 
MAX  MAX(item1, item2[, ...])  Returns the largest item in the list  Mathematical 
MIN  MIN(item1, item2[, ...])  Returns the smallest item in the list  Mathematical 
NUMBER  NUMBER(string)  Converts a string to a number  Mathematical 
POWER  POWER(number, power)  Returns a number raised to a power  Mathematical 
PROD  PROD(number1, number2[, ....])  Multiples all the numbers  Mathematical 
ROUND  ROUND(number[, precision])  Rounds the number up to specified decimals of precision  Mathematical 
SORTASCNUM  SORTASCNUM(number1,number2,...)  Orders the numbers in ascending order.  Mathematical 
SORTDESCNUM  SORTDESCNUM(number1, number2,...)  Orders the numbers in descending order.  Mathematical 
SQRT  SQRT(number)  Returns a square root of a number  Mathematical 
SUB  SUB(number1, number2[, ...])  Subtracts all numbers in the order provided  Mathematical 
SUM  SUM(number1, number2[, ...])  Adds all the numbers  Mathematical 
CONCAT  CONCAT(string1,"separator", string2) 
Concatenates the string. Examples of separators that you can include:

Text 
CONTAINS  CONTAINS(findText, withinText)  Returns true if the findText string is found within the withinText string  Text 
ENCODEURL  ENCODEURL(string)  Escapes any special characters in the string so they an be included in a URL argument  Text 
LEFT  LEFT(string, length)  Returns a specified number of characters from the left side of a string  Text 
LEN  LEN(string)  Returns the length of a string  Text 
LOWER  LOWER(string)  Returns the string in lower case  Text 
REPLACE  REPLACE(string1, string2, string3)  Replaces all occurences of string2 with string3 in string1  Text 
RIGHT  RIGHT(string, length)  Returns a specified number of characters from the right side of a string  Text 
SEARCH  SEARCH(findText, withinText[, start])  Returns the index of the first occurence of findText in the string withinText, starting at the given start position, or 1 if th text is not found  Text 
STRING  STRING(number)  Converts a number to a string  Text 
SORTASCSTRING  SORTASCSTRING(string1, string2, ...)  Sorts a list of strings in ascending order.  Text 
SORTDESCSTRING  SORTDESCSTRING(string1, string2, ...)  Sorts a list of strings in descending order.  Text 
SUBSTR 
SUBSTR({string},number of start position, length of string) 
Return characters of a string based upon the start and end index specified  Text 
TRIM  TRIM(string)  Removes whitespace from the beginning and end of a string  Text 
UPPER  UPPER(string)  Returns a string in upper case  Text 
CASE  CASE(indexNumber, value1, [value2, ...]) 
Used with other expressions to choose a value from a list, based on a index number. An index number is a field or function that returns a numerical value (usually in a known range). CASE(DAYOFWEEK({entryDate}),"Sunday","Monday", "Tuesday","Wednesday","Thursday","Friday","Saturday") This expression works best with other expressions that return a number. For example, DAYOFWEEK, DAYOFMONTH, MONTH. 
Text 
IF  IF(condition, trueExpression, falseExpression)  Evaluates the condition parameter and returns the trueExpression if it is true, or the falseExpression if it is false  Text 
IFIN  IFIN(value, value1[, value2...], trueExpression, falseExpression  If value equals one of the value1, value2... then returns the trueExpression, otherwise returns falseExpression. Should have at least 4 parameters  Text 
IN  IN(value, value1[, value2...])  Returns true if value equals one of the provided value1, value2..., otherwise false  Text 
ISBLANK  ISBLANK(value)  Returns true if the value is null or empty, false otherwise  Text 
Understanding the Syntax of Calculated Data Expressions
Although the data expressions used are the same, the syntax for building a calculated custom field is different than that of building a calculated custom column.
For example:
 To add a calculated data expression to a custom field on a task form for the Project Name, you use the following text:
Project.Name  To add a calculated data expression to a custom column on a task report for the Project Name, you use the following text:
valuefield=project:name
Or
valueexpression={Project}.{Name}
For more information about the syntax you must use in a calculated custom column, see "Understanding Text Mode."
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