Google sunrise calendar times off by TZ offset

Interesting. I'm going to say this is a Google issue. Or maybe the library isn't passing the timezone correctly. I see
&timeZone=America%2FNew_York
in the GET request, but what comes back comes like this

{
 "kind": "calendar#events",
 "etag": "\"p324e1bvntamte0g\"",
 "summary": "Phases of the Moon",
 "updated": "2017-11-07T18:33:19.000Z",
 "timeZone": "UTC",
 "accessRole": "reader",
 "defaultReminders": [],
 "items": [
  {
   "kind": "calendar#event",
   "etag": "\"2453932800000000\"",
   "id": "moonphase+1509772980000",
   "status": "confirmed",
   "htmlLink": "https://www.google.com/calendar/event?eid=bW9vbnBoYXNlKzE1MDk3NzI5ODAwMDAgaHQzamxmYWFjNWxmZDYyNjN1bGZoNHRxbDhAZw&ctz=America/New_York",
   "created": "2008-11-18T00:00:00.000Z",
   "updated": "2008-11-18T00:00:00.000Z",
   "summary": "Full moon 5:23am",
   "creator": {
    "email": "ht3jlfaac5lfd6263ulfh4tql8@group.calendar.google.com",
    "displayName": "Phases of the Moon",
    "self": true
   },
   "organizer": {
    "email": "ht3jlfaac5lfd6263ulfh4tql8@group.calendar.google.com",
    "displayName": "Phases of the Moon",
    "self": true
   },
   "start": {
    "date": "2017-11-04"
   },
   "end": {
    "date": "2017-11-05"
   },
   "visibility": "public",
   "iCalUID": "moonphase+1509772980000@google.com",
   "sequence": 0,
   "gadget": {
    "title": "Full moon 5:23am",
    "iconLink": "https://ssl.gstatic.com/calendar/images/moon/full-moon.gif"
   }
  },
...

So it really looks to me like that TZ in the request is being ignored. I'll poke around a bit, but now I'm wondering if any of the times coming back into my agenda are really "correct" or if it's just because they're in the same TZ as my request already.

I confess this is puzzling. If I go to Google's test site
https://developers.google.com/google-apps/calendar/v3/reference/events/list
and put in the same parameters, it shows me the correct data and timezone. But...it doesn't work when I put together the URL myself, or the way Agenda is doing it. That's confusing....

No idea what Google is doing for this. But the Google test site actually just passes the TZ through. If I put some other TZ, like America/Los_Angeles, it's not actually converting it, it's just setting the &ctz= parameter on the htmlLink.