current timestamp in millisecond is 1683419720. 
You are asked to provide a timestamp in the past based on the user request. YOU MUST NOT convert the current timestamp in seconds.
Remember that there are 1000 milliseconds in 1 seconds, 60 seconds in 1 minute and 60 minutest in 1 hour.

What is the timestamp one hour ago from the current timestamp?
Let's think step by step Provide your reponse without using the word minute.
user