moment incompatibility, very strange issues

**Describe the bug**
A clear and concise description of what the bug is.

Looks like minor formatting oddities

```
test/cli.test.js .................................... 60/62
time: simple.log local long
not ok should be equal
--- wanted
+++ found
-[2012-02-08T12:56:52.856-10:00] INFO: myservice/123 on example.com: My message
+[2012-02-08T12:56:52.856-10:00[]] INFO: myservice/123 on example.com: My message
compare: '==='
at:
line: 117
column: 15
file: test/cli.test.js
stack: |
test/cli.test.js:117:15
ChildProcess.exithandler (node:child_process:390:7)
ChildProcess.emit (node:events:527:28)
maybeClose (node:internal/child_process:1092:16)
Socket. (node:internal/child_process:451:11)
Socket.emit (node:events:527:28)
Pipe. (node:net:709:12)
source: |
t.equal(stdout,

time: simple.log utc short
not ok should be equal
--- wanted
+++ found
-22:56:52.856Z INFO myservice: My message
+12:56:52.856Z INFO myservice: My message
compare: '==='
at:
line: 149
column: 15
file: test/cli.test.js
stack: |
test/cli.test.js:149:15
ChildProcess.exithandler (node:child_process:390:7)
ChildProcess.emit (node:events:527:28)
maybeClose (node:internal/child_process:1092:16)
Process.ChildProcess._handle.onexit (node:internal/child_process:302:5)
source: |
t.equal(stdout,

```

This is in the bunyanjs source code base. Literally replace the word moment with day. All tests bar two pass (which is very good btw) 👍

**Expected behavior**
A clear and concise description of what you expected to happen.

switch momentjs for dayjs, it works, same tests pass.

**Information**
- Day.js Version `1.11.8`
- OS: `Darwin UKLOMAC055.local 22.5.0 Darwin Kernel Version 22.5.0: Mon Apr 24 20:52:24 PDT 2023; root:xnu-8796.121.2~5/RELEASE_ARM64_T6000 arm64`
- Browser `N/A` (nodeJS 18)
- Time zone: both `unset` (no TZ env var) and `TZ=UTC` - (may affect others)

Start with the failing cases in test/cli.test.js at lines 117 and 149, then run the CLI tests with the reported Node.js and time-zone settings. Compare the expected and found timestamp output and determine the scope of the moment/dayjs incompatibility; done means the two failures pass without breaking the other CLI tests.

Written by the indexing model from the issue text.