Thanks for the response, Joe. I am using OOTP19. I worked around the problem by adding some code to the program which generated the XML to adjust the start time based on the time zone. I no longer seem to have the original file, but here is a link to my current schedule file:
https://drive.google.com/open?id=1H8..._BfsZj0c4gixxu
Although the times are not all 1905 anymore, it is still the case that when I imported this file, all of the times are imported as Eastern time. But, since the times were adjusted, they now are the times I wanted.
Can you provide more detail about what is wrong with my header? I am willing to play with fixing that if you let me know what my mistake is.
Thanks,
Bob