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Editorial Team
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Asked: 2026-05-27T12:18:16+00:00

I want to send notifications to users in different timezones on a date and

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I want to send notifications to users in different timezones on a date and time they provide.
I haven’t implemented anything yet, but I plan to create a timestamp column and store everything in UTC. At the time of submission, the user will select a timezone and I will calculate the offset, add it to the timestamp column, and voila.

I wish it were that simple, but my plan lacks DST. I have no way of finding out if the user is in DST or not.

How do I get around this? Do I need extra columns? Is there a better approach than what I’m planning?

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1 Answer

  1. Editorial Team

    You can use the java TimeZone object.

    <cfset tzObj = createObject("java","java.util.TimeZone") >

    You can get a list of available IDs e.g. “US/Pacific” by doing this

    <cfset tzList = arrayToList(tzObj.getAvailableIDs()) >

    If you can match the ID to your users region/time zone you can do the following:

    tzToTest = "US/Pacific"
dateTotest = now()

<!--- determines if dateTotest in tzToTest is in DST --->
<cfset tz = tzObj.getTimeZone(tzToTest) />
<cfset isDaylightSavings = tz.inDaylightTime(dateTotest) />
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