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Support Article

System Datetime func. wrong due to YYYYMMdd mask (s/b yyyyMMdd)



User reports that @PegaRULES Date/Time function defaulting to 12/27/2016; which is causing their validation to fail and impacting their Make Payment functionality. This functionality is critical and due to this issue tuser cannot process the case further.

Error Messages

Not applicable.

Steps to Reproduce

Use the following function call and test during 12/27/2015 to 12/31/2015.

Root Cause

The ISO standard for time incorporates a "week year" that is used for fiscal year calculations.

It is implemented using an uppercase "Y" in format masks. For example, the mask of YYYYMMdd returns "week year" and this can result in a difference of +1 or -1 from the actual year. This issue appears in any software that subscribes to ISO standard, such as Java and Pega.


Change the current mask from YYYYMMdd to yyyyMMdd.


Published January 31, 2016 - Updated October 8, 2020

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