troubleshooting Question

Authorize.net timestamp wrong due to Daylight Savings

Avatar of lonnyo
lonnyo asked on
ColdFusion Language
4 Comments1 Solution891 ViewsLast Modified:
I have an e-commerce site that uses Authorize.net SIM Gateway for processing credit cards.  A unique fingerprint is created for each transaction using a timestamp.  When daylight savings changed, it no longer matches authorize.net time stamp.  My host has verified the settings on the server and it still does not work, so I am forced to fix this within the code.

This is the current code that I am using for the timestamp:
<cfset timestamp=DateDiff("s", "January 1 1970 00:00", DateConvert('local2UTC', Now())) >

I have found other scripts, but they are even further off.

The timestamp can be checked by going to the following link:
http://developer.authorize.net/tools/responsecode97

Authorize.net says the following:
The transaction fingerprint depends on a timestamp expressed in POSIX Time, sometimes called UNIX Epoch Time. Simply put, it is the number of seconds since January 1, 1970, at Midnight UTC. If you take the current time in the server’s time zone and convert that to UTC, and then use that to calculate POSIX Time, that may introduce the risk of the time being miscalculated when the server switches from Standard Time to Daylight Savings Time. This will cause transaction fingerprints to fail.

To avoid this, we (authorize.net) recommend the following:

-Take care to use whatever options are available in your scripting language of choice to use POSIX time automatically, instead of trying to convert from local time to POSIX time. Most scripting languages support POSIX timestamps.
-Make sure the Web server is using UTC, not local time.
-The operating systems on Web servers should be kept up to date. Since Daylight Savings Time is defined by law and is subject to change, servers may need to be updated to reflect changes.
-Where possible, Web servers should use the Network Time Protocol (NTP) to keep their clocks synchronized.
ASKER CERTIFIED SOLUTION
Join our community to see this answer!
Unlock 1 Answer and 4 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 4 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros