Timestamp precision increasing in Messaging API responses and callbacks


Ashley White


What's happening? 

Effective December 9, 2022, all timestamps in messaging API responses and callbacks will support microsecond precision.

What do I need to know?

Prior to this change, timestamps in messaging API responses and callbacks were returned with a mix of millisecond and microsecond precision. In order to create a consistent experience moving forward, all timestamps will be returned with only microsecond precision in ISO 8601 format beginning December 9. 

The following is an example of a timestamp in ISO 8601 format:


What do I need to do?

If your client software is accepting ISO 8601 format with sub-second values up to six decimal places, no action is required. 

If you have coded a restriction on the number of decimal places accepted in API responses, please change your code to accept all six decimal places for microsecond precision. 


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