# Checklist for submitter
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
> [!NOTE]
> For the reviewer, you won't hurt my feelings at all if you have a
better implementation in mind and want to close this out! I'll be
upfront that I'm much more of a Go dev than a frontend dev. I'm just
using this issue as an opportunity to become more familiar with Fleet,
since I'm a fan of what y'all are doing and have been looking for a
project to spend some spare-time contributing to 😄
>
> You should also have edit access to this branch, so feel free to
commandeer it as you see fit.
# Summary
This PR aims to fix a regression identified in #14353 in which certain
"zero" datetimes are displayed as "54 years ago" instead of the
preferred "Never". The "zero" datetimes are commonly used [as a proxy to
indicate](5cb8051a40/server/datastore/mysql/hosts.go (L1649))
that a date wasn't set, e.g. when a host hasn't had its details fetched
yet.
We don't want to apply this treatment to _all_ datetimes, since some
(like vulnerability data) have valid dates before Fleet was created.
To support both use cases, I:
* Added an optional boolean, `cutoffBeforeFleetLaunch`, to indicate that
dates should be cutoff prior to the hardcoded Fleet launch date. This is
set to `false` in `HumanTimeDiffWithDateTip` for
backwards-compatibility.
* Created `HumanTimeDiffWithFleetLaunchCutoff` which is a drop-in
replacement for `HumanTimeDiffWithDateTip` that sets the
`cutoffBeforeFleetLaunch` flag to `true`.
I then used `HumanTimeDiffWithFleetLaunchCutoff` in the various host
related fields I could find. It's possible I missed some, so please
double-check me! I'm still getting my bearings on the codebase.
Here's a screenshot showing the host table with a host that I had
deleted and waited to appear again:
<img width="1381" alt="Screenshot 2023-10-11 at 11 27 29 PM"
src="https://github.com/fleetdm/fleet/assets/1317288/3cd23879-3233-409f-91a0-8b5e02d09deb">
You may find it helpful to review this commit-by-commit.
Closes#14353
39e9cdd7b1