Comparing
- https://archive.softwareheritage.org/api/1/revision/19e50cc37f5f5050c343935b86a030af14b84734/
- https://archive.softwareheritage.org/browse/revision/19e50cc37f5f5050c343935b86a030af14b84734/
The API shows the following timestamp: 2017-04-12T00:13:55+02:00
The browsing interface shows the following: 12 April 2017, 00:13 UTC
Checking the original package, the first info is the correct one and it seems that the browsing interface ignores timezones.