DATEADD |
Description Adds units of time to a date.
Returns A date/time object.
Category Date and time functions
Function syntax
    DateAdd("datepart", number, "date")
See also DateConvert, DatePart, CreateTimeSpan
History ColdFusion MX 6.1: Added the datepart character L or l to represent milliseconds.
Parameters
Usage The datepart specifiers y, d, and w add a number of days to a date. When passing a date/time object as a string, you must enclose it in quotation marks. Otherwise, it is interpreted as a numeric representation of a date/time object.
Example
    <!--- This example shows the use of DateAdd --->
    <cfparam name="value" default="70">
    <cfparam name="type" default="m">

    <!--- if numbers passed, then use those --->
    <cfif IsDefined("form.value")>
       <cfset value = form.value>
    </cfif>
    <cfif IsDefined("form.type")>
       <cfset type = form.type>
    </cfif>

    <cfquery name="GetMessages" datasource="cfdocexamples">
    SELECT   UserName, Subject, Posted
    FROM     Messages
    </cfquery>

    <p>This example uses DateAdd to determine when a message in
    the database will expire. Currently, messages older
    than <cfoutput>#value#</cfoutput>

    <cfswitch expression="#type#">
       <cfcase value="yyyy">years</cfcase>
       <cfcase value="q">quarters</cfcase>
       <cfcase value="m">months</cfcase>
       <cfcase value="y">days of year</cfcase>
       <cfcase value="w">weekdays</cfcase>
       <cfcase value="ww">weeks</cfcase>
       <cfcase value="h">hours</cfcase>
       <cfcase value="n">minutes</cfcase>
       <cfcase value="s">seconds</cfcase>
       <cfdefaultcase>years</cfdefaultcase>
    </cfswitch>
     are expired.

    <table>
    <tr>
       <td>UserName</td>
       <td>Subject</td>
       <td>Posted</td>
    </tr>
    <cfoutput query="GetMessages">
    <tr>
       <td>#UserName#</td>
       <td>#Subject#</td>
       <td>#Posted# <cfif DateAdd(type, value, posted) LT Now()><font
    color="red">EXPIRED</font></cfif></td>
    </tr>
    </cfoutput>
    </table>

    <cfform action="#CGI.Script_Name#" method="post">

    Select an expiration value:
    <cfinput type="Text" name="value" value="#value#" message="Please enter whole
    numbers only" validate="integer" required="Yes">
    <select name="type">
       <option value="yyyy">years
       <option value="m" selected>months
       <option value="d">days
       <option value="ww">weeks
       <option value="h">hours
       <option value="n">minutes
       <option value="s">seconds
    </select>

    <input type="Submit" value="Submit">
    </cfform>

DATEPART |

String:

- yyyy: Year
- q: Quarter
- m: Month
- y: Day of year
- d: Day
- w: Weekday
- ww: Week
- h: Hour
- n: Minute
- s: Second
- l: Millisecond

NUMBER |

Number of units of datepart to add to date (positive, to get dates in the future; negative, to get dates in the past). Number must be an integer.

DATE |

Date/time object, in the range 100 AD-9999 AD.