use SSE time per @migurski

from slack:
```
jden: @erica: engine light is yelling at me when i try to update the monitoring url for our app!
[16:07] jden: "is unavailable or does not return a valid response"
[16:07] jden: when in fact http://dev.bestnestapp.com/.well-known/status
[16:14] migurski: try a unix timestamp? the one there is in msec, which is incorrect
[16:15] migurski: they’re normally in seconds
[16:15] migurski: (my first guess)
```