Bug ID 631530: TAI offset not adjusted immediately during leap second

Last Modified: Jul 12, 2023

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:

Fixed In:
11.5.4 HF3

Opened: Dec 02, 2016

Severity: 3-Major

Related Article: K32246335


When repeating a UTC time value during a leap second (when UTC time should be 23:59:60), the International Atomic Time (TAI) timescale should not stop, the kernel increments the TAI offset one second too late.


Impact to applications unknown, system will stay stable and a timer may be fired off later than expected.


This occurs during an NTP leap second event, for example an event occurs on December 31, 2016, at 23:59:60 UTC



Fix Information

International Atomic Time (TAI) offset during leap second has been corrected.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips