Account delta migration is broken

[kpsf]

If I select migrate data range for accounts, I don't get a different search url. Here's an example:

https://zzz-minjunyang.desk.com/api/v2/companies/search?q=(created_at:[1%20TO%201498525952])&per_page=500&page=1&sort_field=created_at&sort_direction=asc

The minimum created at date here is 1, but it should be the date I select in the UI.