System's timezone isn't correctly recognized/handled

**Describe the bug**
While working with dayjs and the timezone plugin I've noticed incorrect handling of timezones. Checking out the repository and running tests locally in a container results in some tests failing, which I suppose is the reason for the bug I've encountered in development under Node 12.18.0

**Expected behavior**
Tests passing.

**Information**
- v1.8.34
- OS: Debian Buster
- Node 12.18.0
- Time zone: Europe/Berlin

docker-compose.yml used to check out the repository:
```
version: "3.7"

services:
dev:
image: node:12.18.0-buster
command: /bin/sh -c "while sleep 1000; do :; done"
working_dir: /workspace
volumes:
- workspace:/workspace:cached
```

Steps with complete logs:
```
root@f2864ee8e0ca:/workspace/dayjs# export TZ=Europe/Berlin
root@f2864ee8e0ca:/workspace/dayjs# date
Fri Aug 28 17:29:51 CEST 2020
root@f2864ee8e0ca:/workspace/dayjs# npm test

> dayjs@0.0.0-development test /workspace/dayjs
> TZ=Pacific/Auckland npm run test-tz && TZ=Europe/London npm run test-tz && TZ=America/Whitehorse npm run test-tz && npm run test-tz && jest

> dayjs@0.0.0-development test-tz /workspace/dayjs
> date && jest test/timezone.test --coverage=false

Sat Aug 29 03:29:55 NZST 2020
PASS test/timezone.test.js
✓ Add Time days (DST) (5ms)
✓ Utc Offset (3ms)
✓ Diff (DST) (4ms)
✓ UTC add day in DST (1ms)

Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 0.511s, estimated 1s
Ran all test suites matching /test\/timezone.test/i.

> dayjs@0.0.0-development test-tz /workspace/dayjs
> date && jest test/timezone.test --coverage=false

Fri Aug 28 16:29:56 BST 2020
PASS test/timezone.test.js
✓ Add Time days (DST) (9ms)
✓ Utc Offset (1ms)
✓ Diff (DST) (4ms)
✓ UTC add day in DST (1ms)

Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 0.51s, estimated 1s
Ran all test suites matching /test\/timezone.test/i.

> dayjs@0.0.0-development test-tz /workspace/dayjs
> date && jest test/timezone.test --coverage=false

Fri Aug 28 08:29:56 MST 2020
PASS test/timezone.test.js
✓ Add Time days (DST) (6ms)
✓ Utc Offset (4ms)
✓ Diff (DST) (4ms)
✓ UTC add day in DST (1ms)

Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 0.513s, estimated 1s
Ran all test suites matching /test\/timezone.test/i.

> dayjs@0.0.0-development test-tz /workspace/dayjs
> date && jest test/timezone.test --coverage=false

Fri Aug 28 17:29:57 CEST 2020
PASS test/timezone.test.js
✓ Add Time days (DST) (5ms)
✓ Utc Offset (5ms)
✓ Diff (DST) (4ms)
✓ UTC add day in DST (1ms)

Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 0.512s, estimated 1s
Ran all test suites matching /test\/timezone.test/i.
PASS test/comparison.test.js
PASS test/plugin/utc.test.js
PASS test/plugin/localeData.test.js
FAIL test/plugin/badMutable.test.js
● WeekOfYear get week won"t change instance

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2020-08-28T17:29:59+02:00"
Received:
"2019-05-28T17:29:59+02:00"

183 | const format = d.format()
184 | d.week()
> 185 | expect(d.format()).toBe(format)
186 | })
187 |

at Object. (test/plugin/badMutable.test.js:185:22)

PASS test/plugin/duration.test.js
FAIL test/plugin/utc-utcOffset.test.js
● change hours when changing the utc offset in UTC mode

expect(received).toBe(expected) // Object.is equality

Expected value to be:
5
Received:
4

87 | expect(d.hour()).toBe(6)
88 | expect(d.utcOffset(0).hour()).toBe(6)
> 89 | expect(d.utcOffset(-60).hour()).toBe(5)
90 | expect(d.utcOffset(60).hour()).toBe(7)
91 | expect(d.utcOffset(-30).format('HH:mm')).toBe('06:01')
92 | expect(d.utcOffset(30).format('HH:mm')).toBe('07:01')

at Object. (test/plugin/utc-utcOffset.test.js:89:35)

● keep hours when adding month in offset mode

expect(received).toBe(expected) // Object.is equality

Expected value to be:
6
Received:
5

111 | const dm8 = dayjs('2000-01-30T06:31:00-08:00').utcOffset(-8)
112 |
> 113 | expect(d10.add(1, 'month').hour()).toBe(6)
114 | expect(dm8.add(1, 'month').hour()).toBe(6)
115 |
116 | expect(d10.add(-2, 'month').hour()).toBe(6)

at Object. (test/plugin/utc-utcOffset.test.js:113:38)

PASS test/plugin/objectSupport.test.js
PASS test/plugin/isoWeek.test.js
PASS test/plugin/customParseFormat.test.js
PASS test/plugin/isSameOrBefore.test.js
PASS test/plugin/pluralGetSet.test.js
PASS test/parse.test.js
PASS test/display.test.js
PASS test/timezone.test.js
PASS test/locale/et.test.js
PASS test/plugin/weekOfYear.test.js
FAIL test/plugin/timezone.test.js
● DST, a time that never existed Spring Forward › 2012-03-11 01:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T01:59:59-05:00"
Received:
"2012-03-11T00:59:59-05:00"

122 | const d = dayjs.tz(s, NY)
123 | const m = moment.tz(s, NY)
> 124 | expect(d.format()).toBe('2012-03-11T01:59:59-05:00')
125 | expect(d.format()).toBe(m.format())
126 | expect(d.utcOffset()).toBe(-300)
127 | expect(d.utcOffset()).toBe(m.utcOffset())

at Object. (test/plugin/timezone.test.js:124:24)

● DST, a time that never existed Spring Forward › 2012-03-11 02:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:00:00-04:00"
Received:
"2012-03-11T02:00:00-04:00"

133 | const d = dayjs.tz(s, NY)
134 | const m = moment.tz(s, NY)
> 135 | expect(d.format()).toBe('2012-03-11T03:00:00-04:00')
136 | expect(d.format()).toBe(m.format())
137 | expect(d.valueOf()).toBe(m.valueOf())
138 | expect(d.valueOf()).toBe(1331449200000)

at Object. (test/plugin/timezone.test.js:135:24)

● DST, a time that never existed Spring Forward › 2012-03-11 02:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:59:59-04:00"
Received:
"2012-03-11T02:59:59-04:00"

144 | const d = dayjs.tz(s, NY)
145 | const m = moment.tz(s, NY)
> 146 | expect(d.format()).toBe('2012-03-11T03:59:59-04:00')
147 | expect(d.format()).toBe(m.format())
148 | expect(d.valueOf()).toBe(m.valueOf())
149 | expect(d.valueOf()).toBe(1331452799000)

at Object. (test/plugin/timezone.test.js:146:24)

● DST, a time that never existed Spring Forward › 2012-03-11 03:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:00:00-04:00"
Received:
"2012-03-11T02:00:00-04:00"

155 | const d = dayjs.tz(s, NY)
156 | const m = moment.tz(s, NY)
> 157 | expect(d.format()).toBe('2012-03-11T03:00:00-04:00')
158 | expect(d.format()).toBe(m.format())
159 | expect(d.valueOf()).toBe(m.valueOf())
160 | expect(d.valueOf()).toBe(1331449200000)

at Object. (test/plugin/timezone.test.js:157:24)

● DST, a time that never existed Fall Back › 2012-11-04 00:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T00:59:59-04:00"
Received:
"2012-11-03T23:59:59-04:00"

171 | [dayjs, moment].forEach((_) => {
172 | const d = _.tz(s, NY)
> 173 | expect(d.format()).toBe('2012-11-04T00:59:59-04:00')
174 | expect(d.utcOffset()).toBe(-240)
175 | expect(d.valueOf()).toBe(1352005199000)
176 | })

at forEach (test/plugin/timezone.test.js:173:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:171:21)

● DST, a time that never existed Fall Back › 2012-11-04 01:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T01:00:00-04:00"
Received:
"2012-11-04T00:00:00-04:00"

180 | [dayjs, moment].forEach((_) => {
181 | const d = _.tz(s, NY)
> 182 | expect(d.format()).toBe('2012-11-04T01:00:00-04:00')
183 | expect(d.utcOffset()).toBe(-240)
184 | expect(d.valueOf()).toBe(1352005200000)
185 | })

at forEach (test/plugin/timezone.test.js:182:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:180:21)

● DST, a time that never existed Fall Back › 2012-11-04 01:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T01:59:59-04:00"
Received:
"2012-11-04T00:59:59-04:00"

189 | [dayjs, moment].forEach((_) => {
190 | const d = _.tz(s, NY)
> 191 | expect(d.format()).toBe('2012-11-04T01:59:59-04:00')
192 | expect(d.utcOffset()).toBe(-240)
193 | expect(d.valueOf()).toBe(1352008799000)
194 | })

at forEach (test/plugin/timezone.test.js:191:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:189:21)

● DST, a time that never existed Fall Back › 2012-11-04 02:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T02:00:00-05:00"
Received:
"2012-11-04T01:00:00-05:00"

198 | [dayjs, moment].forEach((_) => {
199 | const d = _.tz(s, NY)
> 200 | expect(d.format()).toBe('2012-11-04T02:00:00-05:00')
201 | expect(d.utcOffset()).toBe(-300)
202 | expect(d.valueOf()).toBe(1352012400000)
203 | })

at forEach (test/plugin/timezone.test.js:200:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:198:21)

PASS test/plugin/isBetween.test.js
PASS test/locale/uk.test.js
PASS test/plugin/calendar.test.js
PASS test/locale/pl.test.js
PASS test/locale/fi.test.js
PASS test/locale/sk.test.js
PASS test/locale/ru.test.js
PASS test/plugin/isSameOrAfter.test.js
PASS test/plugin/relativeTime.test.js
PASS test/locale/cs.test.js
PASS test/query.test.js
PASS test/locale/en.test.js
PASS test/plugin/advancedFormat.test.js
PASS test/manipulate.test.js
PASS test/plugin/buddhistEra.test.js
PASS test/plugin/isoWeeksInYear.test.js
PASS test/plugin/updateLocale.test.js
PASS test/plugin/minMax.test.js
PASS test/plugin/weekday.test.js
PASS test/plugin/quarterOfYear.test.js
PASS test/locale/zh-cn.test.js
PASS test/plugin/declarations.test.js
PASS test/get-set.test.js
PASS test/plugin/localizedFormat.test.js
PASS test/plugin/isLeapYear.test.js
PASS test/locale.test.js
PASS test/utils.test.js
PASS test/locale/sv.test.js
PASS test/locale/zh.test.js
PASS test/plugin/dayOfYear.test.js
PASS test/plugin/weekYear.test.js
PASS test/plugin/toArray.test.js
PASS test/constructor.test.js
PASS test/plugin/isTomorrow.test.js
PASS test/plugin.test.js
PASS test/plugin/isToday.test.js
PASS test/plugin/isYesterday.test.js
PASS test/plugin/toObject.test.js
PASS test/plugin/isMoment.test.js
PASS test/locale/keys.test.js
------------------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
------------------------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
src | 100 | 100 | 100 | 100 | |
constant.js | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
utils.js | 100 | 100 | 100 | 100 | |
src/locale | 100 | 100 | 100 | 100 | |
af.js | 100 | 100 | 100 | 100 | |
ar-dz.js | 100 | 100 | 100 | 100 | |
ar-kw.js | 100 | 100 | 100 | 100 | |
ar-ly.js | 100 | 100 | 100 | 100 | |
ar-ma.js | 100 | 100 | 100 | 100 | |
ar-sa.js | 100 | 100 | 100 | 100 | |
ar-tn.js | 100 | 100 | 100 | 100 | |
ar.js | 100 | 100 | 100 | 100 | |
az.js | 100 | 100 | 100 | 100 | |
be.js | 100 | 100 | 100 | 100 | |
bg.js | 100 | 100 | 100 | 100 | |
bi.js | 100 | 100 | 100 | 100 | |
bm.js | 100 | 100 | 100 | 100 | |
bn.js | 100 | 100 | 100 | 100 | |
bo.js | 100 | 100 | 100 | 100 | |
br.js | 100 | 100 | 100 | 100 | |
bs.js | 100 | 100 | 100 | 100 | |
ca.js | 100 | 100 | 100 | 100 | |
cs.js | 100 | 100 | 100 | 100 | |
cv.js | 100 | 100 | 100 | 100 | |
cy.js | 100 | 100 | 100 | 100 | |
da.js | 100 | 100 | 100 | 100 | |
de-at.js | 100 | 100 | 100 | 100 | |
de-ch.js | 100 | 100 | 100 | 100 | |
de.js | 100 | 100 | 100 | 100 | |
dv.js | 100 | 100 | 100 | 100 | |
el.js | 100 | 100 | 100 | 100 | |
en-SG.js | 100 | 100 | 100 | 100 | |
en-au.js | 100 | 100 | 100 | 100 | |
en-ca.js | 100 | 100 | 100 | 100 | |
en-gb.js | 100 | 100 | 100 | 100 | |
en-ie.js | 100 | 100 | 100 | 100 | |
en-il.js | 100 | 100 | 100 | 100 | |
en-in.js | 100 | 100 | 100 | 100 | |
en-nz.js | 100 | 100 | 100 | 100 | |
en-tt.js | 100 | 100 | 100 | 100 | |
en.js | 100 | 100 | 100 | 100 | |
eo.js | 100 | 100 | 100 | 100 | |
es-do.js | 100 | 100 | 100 | 100 | |
es-pr.js | 100 | 100 | 100 | 100 | |
es-us.js | 100 | 100 | 100 | 100 | |
es.js | 100 | 100 | 100 | 100 | |
et.js | 100 | 100 | 100 | 100 | |
eu.js | 100 | 100 | 100 | 100 | |
fa.js | 100 | 100 | 100 | 100 | |
fi.js | 100 | 100 | 100 | 100 | |
fo.js | 100 | 100 | 100 | 100 | |
fr-ca.js | 100 | 100 | 100 | 100 | |
fr-ch.js | 100 | 100 | 100 | 100 | |
fr.js | 100 | 100 | 100 | 100 | |
fy.js | 100 | 100 | 100 | 100 | |
ga.js | 100 | 100 | 100 | 100 | |
gd.js | 100 | 100 | 100 | 100 | |
gl.js | 100 | 100 | 100 | 100 | |
gom-latn.js | 100 | 100 | 100 | 100 | |
gu.js | 100 | 100 | 100 | 100 | |
he.js | 100 | 100 | 100 | 100 | |
hi.js | 100 | 100 | 100 | 100 | |
hr.js | 100 | 100 | 100 | 100 | |
ht.js | 100 | 100 | 100 | 100 | |
hu.js | 100 | 100 | 100 | 100 | |
hy-am.js | 100 | 100 | 100 | 100 | |
id.js | 100 | 100 | 100 | 100 | |
is.js | 100 | 100 | 100 | 100 | |
it-ch.js | 100 | 100 | 100 | 100 | |
it.js | 100 | 100 | 100 | 100 | |
ja.js | 100 | 100 | 100 | 100 | |
jv.js | 100 | 100 | 100 | 100 | |
ka.js | 100 | 100 | 100 | 100 | |
kk.js | 100 | 100 | 100 | 100 | |
km.js | 100 | 100 | 100 | 100 | |
kn.js | 100 | 100 | 100 | 100 | |
ko.js | 100 | 100 | 100 | 100 | |
ku.js | 100 | 100 | 100 | 100 | |
ky.js | 100 | 100 | 100 | 100 | |
lb.js | 100 | 100 | 100 | 100 | |
lo.js | 100 | 100 | 100 | 100 | |
lt.js | 100 | 100 | 100 | 100 | |
lv.js | 100 | 100 | 100 | 100 | |
me.js | 100 | 100 | 100 | 100 | |
mi.js | 100 | 100 | 100 | 100 | |
mk.js | 100 | 100 | 100 | 100 | |
ml.js | 100 | 100 | 100 | 100 | |
mn.js | 100 | 100 | 100 | 100 | |
mr.js | 100 | 100 | 100 | 100 | |
ms-my.js | 100 | 100 | 100 | 100 | |
ms.js | 100 | 100 | 100 | 100 | |
mt.js | 100 | 100 | 100 | 100 | |
my.js | 100 | 100 | 100 | 100 | |
nb.js | 100 | 100 | 100 | 100 | |
ne.js | 100 | 100 | 100 | 100 | |
nl-be.js | 100 | 100 | 100 | 100 | |
nl.js | 100 | 100 | 100 | 100 | |
nn.js | 100 | 100 | 100 | 100 | |
oc-lnc.js | 100 | 100 | 100 | 100 | |
pa-in.js | 100 | 100 | 100 | 100 | |
pl.js | 100 | 100 | 100 | 100 | |
pt-br.js | 100 | 100 | 100 | 100 | |
pt.js | 100 | 100 | 100 | 100 | |
ro.js | 100 | 100 | 100 | 100 | |
ru.js | 100 | 100 | 100 | 100 | |
rw.js | 100 | 100 | 100 | 100 | |
sd.js | 100 | 100 | 100 | 100 | |
se.js | 100 | 100 | 100 | 100 | |
si.js | 100 | 100 | 100 | 100 | |
sk.js | 100 | 100 | 100 | 100 | |
sl.js | 100 | 100 | 100 | 100 | |
sq.js | 100 | 100 | 100 | 100 | |
sr-cyrl.js | 100 | 100 | 100 | 100 | |
sr.js | 100 | 100 | 100 | 100 | |
ss.js | 100 | 100 | 100 | 100 | |
sv.js | 100 | 100 | 100 | 100 | |
sw.js | 100 | 100 | 100 | 100 | |
ta.js | 100 | 100 | 100 | 100 | |
te.js | 100 | 100 | 100 | 100 | |
tet.js | 100 | 100 | 100 | 100 | |
tg.js | 100 | 100 | 100 | 100 | |
th.js | 100 | 100 | 100 | 100 | |
tk.js | 100 | 100 | 100 | 100 | |
tl-ph.js | 100 | 100 | 100 | 100 | |
tlh.js | 100 | 100 | 100 | 100 | |
tr.js | 100 | 100 | 100 | 100 | |
tzl.js | 100 | 100 | 100 | 100 | |
tzm-latn.js | 100 | 100 | 100 | 100 | |
tzm.js | 100 | 100 | 100 | 100 | |
ug-cn.js | 100 | 100 | 100 | 100 | |
uk.js | 100 | 100 | 100 | 100 | |
ur.js | 100 | 100 | 100 | 100 | |
uz-latn.js | 100 | 100 | 100 | 100 | |
uz.js | 100 | 100 | 100 | 100 | |
vi.js | 100 | 100 | 100 | 100 | |
x-pseudo.js | 100 | 100 | 100 | 100 | |
yo.js | 100 | 100 | 100 | 100 | |
zh-cn.js | 100 | 100 | 100 | 100 | |
zh-hk.js | 100 | 100 | 100 | 100 | |
zh-tw.js | 100 | 100 | 100 | 100 | |
zh.js | 100 | 100 | 100 | 100 | |
src/plugin/advancedFormat | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/badMutable | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/buddhistEra | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/calendar | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/customParseFormat | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/dayOfYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/duration | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isBetween | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isLeapYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isMoment | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isSameOrAfter | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isSameOrBefore | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isToday | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isTomorrow | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isYesterday | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isoWeek | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/isoWeeksInYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/localeData | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/localizedFormat | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/minMax | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/objectSupport | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/pluralGetSet | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/quarterOfYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/relativeTime | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/timezone | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/toArray | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/toObject | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/updateLocale | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/utc | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/weekOfYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/weekYear | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
src/plugin/weekday | 100 | 100 | 100 | 100 | |
index.js | 100 | 100 | 100 | 100 | |
------------------------------|----------|----------|----------|----------|-------------------|
Handlebars: Access has been denied to resolve the property "statements" because it is not an "own property" of its parent.
You can add a runtime option to disable the check or this warning:
See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details
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You can add a runtime option to disable the check or this warning:
See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details
Handlebars: Access has been denied to resolve the property "functions" because it is not an "own property" of its parent.
You can add a runtime option to disable the check or this warning:
See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details
Handlebars: Access has been denied to resolve the property "lines" because it is not an "own property" of its parent.
You can add a runtime option to disable the check or this warning:
See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details

Summary of all failing tests
FAIL test/plugin/badMutable.test.js
● WeekOfYear get week won"t change instance

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2020-08-28T17:29:59+02:00"
Received:
"2019-05-28T17:29:59+02:00"

183 | const format = d.format()
184 | d.week()
> 185 | expect(d.format()).toBe(format)
186 | })
187 |

at Object. (test/plugin/badMutable.test.js:185:22)

FAIL test/plugin/utc-utcOffset.test.js
● change hours when changing the utc offset in UTC mode

expect(received).toBe(expected) // Object.is equality

Expected value to be:
5
Received:
4

87 | expect(d.hour()).toBe(6)
88 | expect(d.utcOffset(0).hour()).toBe(6)
> 89 | expect(d.utcOffset(-60).hour()).toBe(5)
90 | expect(d.utcOffset(60).hour()).toBe(7)
91 | expect(d.utcOffset(-30).format('HH:mm')).toBe('06:01')
92 | expect(d.utcOffset(30).format('HH:mm')).toBe('07:01')

at Object. (test/plugin/utc-utcOffset.test.js:89:35)

● keep hours when adding month in offset mode

expect(received).toBe(expected) // Object.is equality

Expected value to be:
6
Received:
5

111 | const dm8 = dayjs('2000-01-30T06:31:00-08:00').utcOffset(-8)
112 |
> 113 | expect(d10.add(1, 'month').hour()).toBe(6)
114 | expect(dm8.add(1, 'month').hour()).toBe(6)
115 |
116 | expect(d10.add(-2, 'month').hour()).toBe(6)

at Object. (test/plugin/utc-utcOffset.test.js:113:38)

FAIL test/plugin/timezone.test.js
● DST, a time that never existed Spring Forward › 2012-03-11 01:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T01:59:59-05:00"
Received:
"2012-03-11T00:59:59-05:00"

122 | const d = dayjs.tz(s, NY)
123 | const m = moment.tz(s, NY)
> 124 | expect(d.format()).toBe('2012-03-11T01:59:59-05:00')
125 | expect(d.format()).toBe(m.format())
126 | expect(d.utcOffset()).toBe(-300)
127 | expect(d.utcOffset()).toBe(m.utcOffset())

at Object. (test/plugin/timezone.test.js:124:24)

● DST, a time that never existed Spring Forward › 2012-03-11 02:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:00:00-04:00"
Received:
"2012-03-11T02:00:00-04:00"

133 | const d = dayjs.tz(s, NY)
134 | const m = moment.tz(s, NY)
> 135 | expect(d.format()).toBe('2012-03-11T03:00:00-04:00')
136 | expect(d.format()).toBe(m.format())
137 | expect(d.valueOf()).toBe(m.valueOf())
138 | expect(d.valueOf()).toBe(1331449200000)

at Object. (test/plugin/timezone.test.js:135:24)

● DST, a time that never existed Spring Forward › 2012-03-11 02:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:59:59-04:00"
Received:
"2012-03-11T02:59:59-04:00"

144 | const d = dayjs.tz(s, NY)
145 | const m = moment.tz(s, NY)
> 146 | expect(d.format()).toBe('2012-03-11T03:59:59-04:00')
147 | expect(d.format()).toBe(m.format())
148 | expect(d.valueOf()).toBe(m.valueOf())
149 | expect(d.valueOf()).toBe(1331452799000)

at Object. (test/plugin/timezone.test.js:146:24)

● DST, a time that never existed Spring Forward › 2012-03-11 03:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-03-11T03:00:00-04:00"
Received:
"2012-03-11T02:00:00-04:00"

155 | const d = dayjs.tz(s, NY)
156 | const m = moment.tz(s, NY)
> 157 | expect(d.format()).toBe('2012-03-11T03:00:00-04:00')
158 | expect(d.format()).toBe(m.format())
159 | expect(d.valueOf()).toBe(m.valueOf())
160 | expect(d.valueOf()).toBe(1331449200000)

at Object. (test/plugin/timezone.test.js:157:24)

● DST, a time that never existed Fall Back › 2012-11-04 00:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T00:59:59-04:00"
Received:
"2012-11-03T23:59:59-04:00"

171 | [dayjs, moment].forEach((_) => {
172 | const d = _.tz(s, NY)
> 173 | expect(d.format()).toBe('2012-11-04T00:59:59-04:00')
174 | expect(d.utcOffset()).toBe(-240)
175 | expect(d.valueOf()).toBe(1352005199000)
176 | })

at forEach (test/plugin/timezone.test.js:173:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:171:21)

● DST, a time that never existed Fall Back › 2012-11-04 01:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T01:00:00-04:00"
Received:
"2012-11-04T00:00:00-04:00"

180 | [dayjs, moment].forEach((_) => {
181 | const d = _.tz(s, NY)
> 182 | expect(d.format()).toBe('2012-11-04T01:00:00-04:00')
183 | expect(d.utcOffset()).toBe(-240)
184 | expect(d.valueOf()).toBe(1352005200000)
185 | })

at forEach (test/plugin/timezone.test.js:182:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:180:21)

● DST, a time that never existed Fall Back › 2012-11-04 01:59:59

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T01:59:59-04:00"
Received:
"2012-11-04T00:59:59-04:00"

189 | [dayjs, moment].forEach((_) => {
190 | const d = _.tz(s, NY)
> 191 | expect(d.format()).toBe('2012-11-04T01:59:59-04:00')
192 | expect(d.utcOffset()).toBe(-240)
193 | expect(d.valueOf()).toBe(1352008799000)
194 | })

at forEach (test/plugin/timezone.test.js:191:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:189:21)

● DST, a time that never existed Fall Back › 2012-11-04 02:00:00

expect(received).toBe(expected) // Object.is equality

Expected value to be:
"2012-11-04T02:00:00-05:00"
Received:
"2012-11-04T01:00:00-05:00"

198 | [dayjs, moment].forEach((_) => {
199 | const d = _.tz(s, NY)
> 200 | expect(d.format()).toBe('2012-11-04T02:00:00-05:00')
201 | expect(d.utcOffset()).toBe(-300)
202 | expect(d.valueOf()).toBe(1352012400000)
203 | })

at forEach (test/plugin/timezone.test.js:200:26)
at Array.forEach ()
at Object. (test/plugin/timezone.test.js:198:21)

Test Suites: 3 failed, 54 passed, 57 total
Tests: 11 failed, 541 passed, 552 total
Snapshots: 0 total
Time: 2.306s
Ran all test suites.
npm ERR! Test failed. See above for more details.
```

Run npm test with the reported TZ settings and review the failures in test/plugin/timezone.test.js, test/plugin/badMutable.test.js, and test/plugin/utc-utcOffset.test.js. Trace the timezone plugin entry points involved in those cases and compare the observed results with the expectations and Moment comparisons shown in the tests. Done means the affected tests pass across the listed time zones without regressing the existing suite.

Written by the indexing model from the issue text.