I can reproduce this issue on Ubuntu 18.04 "xenial" (with tzdata 2021a-0ubuntu0.16.04 and coreutils 8.25-2ubuntu3~16.04) by running:
``` TZ=America/Los_Angeles date -d "Sun Mar 12 02:38:57 UTC 2017" ```
The date command is shipped by the coreutils package.
This bug is fixed in coreutils 8.28-1ubuntu1 in Ubuntu 20.04 (bionic).
I can reproduce this issue on Ubuntu 18.04 "xenial" (with tzdata 2021a-0ubuntu0. 16.04 and coreutils 8.25-2ubuntu3~ 16.04) by running:
``` Los_Angeles date -d "Sun Mar 12 02:38:57 UTC 2017"
TZ=America/
```
The date command is shipped by the coreutils package.
This bug is fixed in coreutils 8.28-1ubuntu1 in Ubuntu 20.04 (bionic).