Trying to Convert Date Time to UTC and Back to Date Time Structure

I’m trying to use the nodes below to take an incoming date/time (in UTC) and convert it to Eastern Standard Time. However, using the nodes below and stepping through using the debugger, the date and time are correct until the “Date Time from String” node, which then produces a date and time that is all 1s. Is there a different set of nodes to use so that this doesn’t happen? Or is there a different work around I should be using to convert the text to a date/time structure?