# WARN \[timesync\] time jump detected. Resetting time synchroniser

**URL:** <https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270>\
**Category:** PX4 Autopilot\
**Created:** [June 17, 2024, 6:55am UTC](https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270 "2024-06-17T06:55:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anyoneonly12345](https://discuss.px4.io/user_avatar/discuss.px4.io/anyoneonly12345/32/16634_2.png) [@anyoneonly12345](https://discuss.px4.io/u/anyoneonly12345)\
**Post date:** [June 17, 2024, 6:55am UTC](https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270/1 "2024-06-17T06:55:38Z")

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I follow the ROS2 User Guide step by step:[https://docs.px4.io/main/en/ros2/](https://docs.px4.io/main/en/ros2/)  
But when I Start a PX4 [Gazebo](https://docs.px4.io/main/en/sim_gazebo_gz/) simulation,the issue will come:  
WARN [timesync] time jump detected. Resetting time synchroniser.  
WARN [uxrce\_dds\_client] time sync no longer converged  
INFO [uxrce\_dds\_client] time sync converged

 ![Screenshot from 2024-06-17 14-46-43](https://discuss.px4.io/uploads/default/original/3X/d/c/dc9c1444b42c6c5bb67eecc43197f7ad42eccd71.png)

If i don’t open the client, there is no problem with the PX4 Gazebo terminate  
How can I solve this problem

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**Author:** ![xdwgood](https://discuss.px4.io/user_avatar/discuss.px4.io/xdwgood/32/5429_2.png) [@xdwgood](https://discuss.px4.io/u/xdwgood)\
**Post date:** [June 17, 2024, 8:08am UTC](https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270/2 "2024-06-17T08:08:44Z")

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I remember the official said that synchronization could be cancelled in the simulation.  
set UXRCE\_DDS\_SYNCT 0

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**Author:** ![xdwgood](https://discuss.px4.io/user_avatar/discuss.px4.io/xdwgood/32/5429_2.png) [@xdwgood](https://discuss.px4.io/u/xdwgood)\
**Post date:** [June 17, 2024, 8:12am UTC](https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270/3 "2024-06-17T08:12:28Z")

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![image](https://discuss.px4.io/uploads/default/original/3X/a/1/a1ce63b0152e4ce6554fe9feb863aa7538122008.png)

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<div class="post-metadata">

**Author:** ![anyoneonly12345](https://discuss.px4.io/user_avatar/discuss.px4.io/anyoneonly12345/32/16634_2.png) [@anyoneonly12345](https://discuss.px4.io/u/anyoneonly12345)\
**Post date:** [June 17, 2024, 9:14am UTC](https://discuss.px4.io/t/warn-timesync-time-jump-detected-resetting-time-synchroniser/39270/4 "2024-06-17T09:14:05Z")

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yes,I was not familar with QGroundControl,so I didn’t know how to solve it.  
This problem is finished by  
open QGroundControl-\>cilck left top side-\>find parameter in the left menu-\>search UXRCE\_DDS\_SYNCT-\> set two parameters to value disable

thank you vary much ❤