The code below first gets a list of server names from a text file. It then loops through that list grabbing a date/time stamp that is inside of another text file that is located on each of those servers.
I am trying to build an object that contains two properties: 'Server' and 'Datetime'. I would then like to add the server name and the date/time info that is collected from each loop iteration to the object. So far I can only add a single row to the object. How can I add multiple rows to it? Does the hash table created before need to contain the multiple rows of data before making it into an object?
For example, when you run Get-Service, it outputs multiple objects to the pipeline, not one object with many 'rows.' So, you'd want to do the same thing: write each object to the pipeline (which you're doing). That would allow your script to be piped to other commands. For example, ".\My-Script.ps1 | Export-CSV" would write your multiple objects to a CSV file.
Now, if I'm understanding you correctly, you're saying you may have multiple timestamps per server? That's fine – just do what you've done, more or less. A property of an object can itself be a collection of objects. The only thing I see wrong in your example is that you used $datetime_stamp instead of $datetime_stamps.