Missing timestamps with the pcd file

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Hi,

Can anyone please ell me how I can get the timestamp of the point cloud in the pcd file generated from the ros bag using the following command

rosrun pcl_ros pointcloud_to_pcd input:=/os1_cloud_node/points

I am not getting any time stamps with the generated pcd files by using the above command.

My bag file is as follow https://drive.google.com/file/d/1UdOW...

And the following is a sample o the pcd file generated from the above command

https://drive.google.com/file/d/1G_Um...

Can anyone please help me with this problem ?

Thanks

Thanks