# Timestamp not syncing with PX4 simulation with gazebo /clock topic

**URL:** <https://discuss.px4.io/t/timestamp-not-syncing-with-px4-simulation-with-gazebo-clock-topic/49030>\
**Category:** PX4 Autopilot\
**Created:** [May 26, 2026, 5:30pm UTC](https://discuss.px4.io/t/timestamp-not-syncing-with-px4-simulation-with-gazebo-clock-topic/49030 "2026-05-26T17:30:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Himanshu069](https://discuss.px4.io/user_avatar/discuss.px4.io/himanshu069/32/19834_2.png) [@Himanshu069](https://discuss.px4.io/u/Himanshu069)\
**Post date:** [May 26, 2026, 5:30pm UTC](https://discuss.px4.io/t/timestamp-not-syncing-with-px4-simulation-with-gazebo-clock-topic/49030/1 "2026-05-26T17:30:37Z")

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As outlined in the docs [ROS 2 User Guide | PX4 Guide (v1.16)](https://docs.px4.io/v1.16/en/ros2/user_guide#ros-gazebo-and-px4-time-synchronization) , making UXRCE\_DDS\_SYNCT to disabled and running the /clock ros\_gz\_bridge should result in timestamp being synchronized, but it fails to happen.(px4 v1.16)

```auto
himanshu@himanshu-Nitro-AN515-54:~$ ros2 topic echo /fmu/out/sensor_combined --once
timestamp: 42340000
gyro_rad:
- 9.754575876286253e-05
- -0.00024570574169047177
- 0.00048402257380075753
gyro_integral_dt: 4000
accelerometer_timestamp_relative: 0
accelerometer_m_s2:
- -0.0037437661085277796
- 0.005152125842869282
- -9.807798385620117
accelerometer_integral_dt: 4000
accelerometer_clipping: 0
gyro_clipping: 0
accel_calibration_count: 0
gyro_calibration_count: 1
---
himanshu@himanshu-Nitro-AN515-54:~$ ros2 topic echo /clock --once
clock:
  sec: 47
  nanosec: 396000000
---

```

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<div class="post-metadata">

**Author:** ![system](https://discuss.px4.io/uploads/default/original/3X/7/3/73ce918bdcd64854de904f0c8d9ab70ca9723f2a.png) [@system](https://discuss.px4.io/u/system)\
**Post date:** [August 24, 2026, 5:30pm UTC](https://discuss.px4.io/t/timestamp-not-syncing-with-px4-simulation-with-gazebo-clock-topic/49030/2 "2026-08-24T17:30:46Z")

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