Description
Adds units of time to a date.
Returns
A date/time object.
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
Parameter |
Description |
|---|---|
datepart |
String:
|
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. |
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, enclose it in quotation marks. Otherwise, it is interpreted as a numeric representation of a date/time object.
Example
<cfset date="{ts '2433-09-01 23:59:59'}">
<cfoutput>#date#</cfoutput>
<cfset diff=30>
<cfset posdateresult=DateAdd("s",diff,date1)>
<cfoutput>#posdateresult#</cfoutput>
<!--- 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>
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