various Alternatives and Corrections to de_DE data

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German / Date & Time / Gregorian

​http://st.unicode.org/cldr-apps/v#/de/Gregorian/1ec76a162df4783a

Months - Wide - Formatting Months - Wide - Standalone

Historic Germanized names (often attributed to Charlemagne’s administration) are still sometimes used.
They may be worth being available as a variant.
I don’t think they ever evolved conventional abbreviated forms, though, because roman numerals were common in the past.
Below, ‘…mon.’ means that either ‘…monat’ (month) or ‘…mond’ (moon) or both have been used.

Jan

‘Hartung’ / ‘Hartmon.’ (‘Schneemon.’, ‘Eismon.’, ‘Wintermon.’, ‘Wolfsmon.’)

Feb

‘Hornung’ (‘Schmelzmon.’, ‘Taumon.’, ‘Narrenmon.’)

Mar

‘Lenzing’ / ‘Lenz’ / ‘Lenzmon.’ (‘Frühlingsmon.’)

Apr

‘Launing’ (‘Ostermon.’, ‘Wandelmon.’, ‘Grasmon.’)

May

‘Bleuet’ (‘Wonnemon.’, ‘Blumenmon.‘, ‘Blühmon.’)

Jun

‘Brachet’ / ‘Brachmon.’ (‘Johannismon.’, ‘Rosenmon.’)

Jul

‘Heuert’ / ‘Heumon.’ (‘Honigmon.’, ‘Bärenmon.’)

Aug

‘Ernting’ / ‘Erntemon.’ (‘Erntemon.’, ‘Ährenmon.’, ‘Sichelmon.’, ‘Bisemon.’)

Sep

‘Scheiding’ / ‘Scheidemon.’ (‘Holzing’ / ‘Holzmon.’, ‘Engelmonat’)

Oct

‘Gilbhart’ / ‘Gilbhart’ (‘Weinmon.’)

Nov

‘Nebelung’ / ‘Nebelmon.’ (‘Windmon.’, ‘Schlachtmon.’, ‘Wintermon.’)

Dec

‘Wendeling’ (‘Christmon.’, ‘Julmon.’, ‘Dustermon.’, ‘Heilmon.’)

There are some aural variants, relevant to speech synthesis and recognition, which are almost never represented in writing (unlike ‘Jänner’ and ‘Feber’ or ‘Märzen’ and ‘Augustus’):

Jun

‘Juno’

Jul

‘Julei’ / ‘Julai’

Months - Abbreviated - Formatting

Feb

‘Februar’ is seldomly abbreviated ‘Febr.’ instead (but never ‘Febr’).

Mar

‘März’ is rarely abbreviated ‘Mar.’ instead.

Aug

‘August’ is rarely abbreviated ‘Augt.’ instead (but never ‘Augt’).

Sep

‘September’ is sometimes abbreviated ‘Sept.’ instead (but never ‘Sept’).

Months - Abbreviated - Standalone

Mar

‘März’ is sometimes abbreviated ‘Mrz’ instead (but never ‘Mrz.’).

Months - Narrow - Formatting Months - Narrow - Standalone

Uppercase and less often lowercase roman numerals have often been used for months in German, when day and year were not. That use still hasn’t dies out. It is less uncommon and less ambiguous than a single initial letter, though wider (unless one uses precomposed CJK compatibility characters).

Jan

‘I’ / ‘i’
‘Ⅰ’ / ‘ⅰ’

Feb

‘II’ / ‘ii’ / ‘ij’
‘Ⅱ’ / ‘ⅱ’

Mar

‘III’ / ‘iii’ / ‘iij’
‘Ⅲ’ / ‘ⅲ’

Apr

‘IIII’ / ‘iiii’ / ‘iiij’
‘IV’ / ‘iv’
‘Ⅳ’ / ‘ⅳ’

May

‘V’ / ‘v’
‘Ⅴ’ / ‘ⅴ’

Jun

‘VI’ / ‘vi’ / ‘vj’
‘Ⅵ’ / ‘ⅵ’

Jul

‘VII’ / ‘vii’ / ‘vij’
‘Ⅶ’ / ‘ⅶ’

Aug

‘VIII’ / ‘viii’ / ‘viij’
‘Ⅷ’ / ‘ⅷ’

Sep

‘VIIII’ / ‘viiii’ / ‘viiij’
‘IX’ / ‘ix’
‘Ⅸ’ / ‘ⅸ’

Oct

‘X’ / ‘x’
‘Ⅹ’ / ‘ⅹ’

Nov

‘XI’ / ‘xi’ / ‘xj’
‘Ⅺ’ / ‘ⅺ’

Dec

‘XII’ / ‘xii’ / ‘xij’
‘Ⅻ’ / ‘ⅻ’

Astronomic symbols for the sign of the zodiac are also unambiguous, surprisingly well known and directly associated to the Julian/Gregorian months.

Jan

‘♑’

Feb

‘♒’

Mar

‘♓’

Apr

‘♈’

May

‘♉’

Jun

‘♊’

Jul

‘♋’

Aug

‘♌’

Sep

‘♍’

Oct

‘♎’

Nov

‘♏’

Dec

‘♐’

Days - Wide - Formatting Days - Wide - Standalone Days - Abbreviated - Formatting Days - Short - Formatting Days - Short - Standalone

sat

‘Sonnabend’

sat

‘Sbd.’

‘Sbd’ never appears without a trailing period and, yes, it’s strange to see it next to 2-letter abbreviations, but not uncommon in the North and East of Germany.

Days - Narrow - Formatting Days - Narrow - Standalone

Astronomic symbols are unambiguous though rarely used today for the days of the week.

Sun

‘☉’ / ‘☼’

Mon

‘☽’ / ‘☾’

Tue

‘♂’

Wed

‘☿’

Thu

‘♃’

Fri

‘♀’

Sat

‘♄’

Maybe there should be a more generic “Days - Symbol” and “Months - Symbol” or even a und-symbol or und-emoji locale which could serve as a fallback for multiple languages.

Day Periods - Wide - …

Some more specific variants exist to specify ‘early’ and ‘late’ periods.

• ‘frühmorgens’: ca. 04:00 or 05:00 through 06:00 or 07:00
• ‘spätmorgens’: (rare) ca. 08:00 or 09:00 through 10:00 or 11:00,
  basically equivalent to ‘vormittags’
• ‘frühabends’: ca. 17:00 or 18:00 through 19:00
• ‘spätabends’: ca. 21:00 or 22:00 through 23:00 or 24:00
• (*‘frühnachts’ is not used)
• ‘spätnachts’: ca. 01:00 or 02:00 through 03:00 or 04:00

Day Periods - Narrow - Formatting

Since abbreviated or symbolic AM and PM indicators are virtually unused outside badly localized software, one would actually fare better with sunrise and sunset emojis:

am

‘🌄’
‘🌅’

pm

‘🌇’

Formats - Standard - Date Formats

A year without century is traditionally abbreviated with an apostrophe in front, at least in alphanumeric date formats.

medium

d. MMM ’yy
d. MMMM ’yy

ISO 8609 formats with hyphen are also acceptable.

Formats - Standard - Time Formats

Timezone would usually be indicated with ‘MEZ±…’ or ‘MESZ±…’ for “Mitteleuropäische [Sommer-]Zeit” (CET), not ‘GMT±…’, in long and other named timezones are hardly used at all, so ‘zzzz’ for full looks very strange.

Short times can also be provided as H.mm 'Uhr'.

Formats - Flexible - Date Formats

MMMMW-one, MMMMW-other

W. 'Woche' 'im' MMMM

yw-one, yw-other

'Kalenderwoche' w, y
'KW' w, y

Formats - Flexible - 12 Hour Time Formats

German traditionally uses a different separator for times given in the 12-hour clock, the period instead of the colon, and suffix 'Uhr' is almost mandatory then.

Ed

d. (E)
d. (ccc)
E (d.)
ccc (d.)

h

h 'Uhr' (no a)

hm

h.mm 'Uhr' (no a)

hms

h.mm:ss 'Uhr' (no a)

yM

M/y
‘1999 IX’ / ‘IX 1999’ / ‘1999ix’ / ‘ix1999’ …

yMM

MM/y
y-MM
y 'M' MM

yQQQ

QQQ, y
yQQQ

Formats - Intervals - Date Formats

Literal 'bis' would be preferred over en-dash – in many cases.

MEd/d

dd.MM. (E) – dd.MM. (E)
dd.–dd.MM. (E–E)

MMM/M

LLL–LLL

MMMEd/d

E–E, d.–d. MMM
d.–d. MMM (E–E)

yM/M

MM–MM/y

yM/y

MM/y – MM/y

yMd/d

dd.–dd.MM.y

yMd/M

dd.MM. – dd.MM.y

yMEd/d

E–E, d.–d.MM.y
d.–d.MM.y (E–E)

yMEd/M

E, d.MM. – E, d.MM.y

yMMM/M

LLL–LLL y

yMMMEd/d

E–E, d.–d. MMM y
d.–d. MMM y (E–E)

Formats - Intervals - 12 Hour Time Formats

h/a

h 'Uhr' – h 'Uhr' 'über Mittag'
h–h 'Uhr' 'über Mittag' for AM/PM transition or
“… 'über Mitternacht'” for PM/AM transition

hm/a

h.mm a – h.mm a
h.mm – h.mm 'Uhr' 'über' 'Mittag/Mitternacht'

hm/h

h.mm–h.mm a

hm/m

h.mm–h.mm a

hmv/a

h.mm a – h.mm a v
h.mm – h.mm 'Uhr' 'über' 'Mittag/Mitternacht' v

hmv/h

h.mm–h.mm a v

hmv/m

h.mm–h.mm a v

[mark]

We are not set up to have as many alternate forms at this time. For the main forms, we suggest that you get a survey tool account for next year, where you can interact with others.

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For times and weeks at least, I’d consider most of my comments to be corrections or improvements, not alternatives.