设置ColdFusion变量

Question

I have a problem setting a variable where I am unable to set a variable as a ColdFusion variable that calculates anything that is less than or equals to 90 days from today as shown below. I am getting an error when I try to set the variable as below:

sLate = now() >= 90 

If I cannot create a variable as above, I would like to compare dates between now, and 90 days before now, and publish the output to a variable.

Answer 1

This code snippet should give you a little heads up on how to work with dates. Note that you may want to strip the time portion out of the dates as you might get unexpected results.

eg Without striping the time element comparing these values will give you ZERO instead of 1 as expected.

<cfset dateA = createDateTime(2014,6,4,0,13,0,0)>
<cfset dateB = createDateTime(2014,6,5,0,1,0,0)>
Result A:#dateDiff("d",dateA,dateB)#<br>

<cfset dateA = createDate(2014,6,4)>
<cfset dateB = createDate(2014,6,5)>
Result B:#dateDiff("d",dateA,dateB)#<br>

Hope this example points you in the right direction.

<cfset TODAY = now()>
<cfset pastDate = dateAdd("d",-90,TODAY)>
<cfset myDate = createDate(2014,6,4)>
<cfset pastDays = dateDiff("d",myDate,TODAY)>

<cfoutput>
Today:#TODAY#<br>
90 days before today:#pastDate#<br>
My Date:#myDate#<br>
My Date happened #pastDays# days before today.
</cfoutput>

Answer 2

<cfset sLate=DateAdd("d",-90,now())>

If in cfscript:
sLate=DateAdd("d",-90,now());

As others have mentioned you are using wrong syntax. Also from your last line I understand that you want a value 90 days earlier than now. -90 will give a value 90 days earlier and using 90 will provide value of 90 days later from current day.