Fable: DateTime Format ToString("MMMM yyyy");
brase
All 11 comments
````
Microsoft (R) F# Interactive version 10.2.3 for F# 4.5
Copyright (c) Microsoft Corporation. All Rights Reserved.
For help type #help;;
silentCd @".";;
- # 1 @"Untitled-1"
- ;;
let x = System.DateTime.Now;;
val x : System.DateTime = 10/5/2018 10:53:26 PM
x.ToString("MMMM yyyy");;
val it : string = "October 2018"
````
Reproduced expected result in FSI.
https://github.com/fable-compiler/Fable/blob/e7954a067437feb8d52801c27c44d6fdc99cfbe3/src/js/fable-core/Util.ts#L202
I believe is the function with the incorrect code.
here is the full implementation
voronoipotato
on 6 Oct 2018
https://momentjs.com/ might be a good thing to use here once we get to localization, though we would have to translate from .net's patterns to moment-js patterns. I'm aware we may not fully replicate DateTime.ToString here but a little probably goes a long way.
Customized format patterns:
P.S. Format in the table below is the internal number format used to display the pattern.
Patterns Format Description Example
========= ========== ===================================== ========
"h" "0" hour (12-hour clock)w/o leading zero 3
"hh" "00" hour (12-hour clock)with leading zero 03
"hh*" "00" hour (12-hour clock)with leading zero 03
"H" "0" hour (24-hour clock)w/o leading zero 8
"HH" "00" hour (24-hour clock)with leading zero 08
"HH*" "00" hour (24-hour clock) 08
"m" "0" minute w/o leading zero
"mm" "00" minute with leading zero
"mm*" "00" minute with leading zero
"s" "0" second w/o leading zero
"ss" "00" second with leading zero
"ss*" "00" second with leading zero
"f" "0" second fraction (1 digit)
"ff" "00" second fraction (2 digit)
"fff" "000" second fraction (3 digit)
"ffff" "0000" second fraction (4 digit)
"fffff" "00000" second fraction (5 digit)
"ffffff" "000000" second fraction (6 digit)
"fffffff" "0000000" second fraction (7 digit)
"F" "0" second fraction (up to 1 digit)
"FF" "00" second fraction (up to 2 digit)
"FFF" "000" second fraction (up to 3 digit)
"FFFF" "0000" second fraction (up to 4 digit)
"FFFFF" "00000" second fraction (up to 5 digit)
"FFFFFF" "000000" second fraction (up to 6 digit)
"FFFFFFF" "0000000" second fraction (up to 7 digit)
"t" first character of AM/PM designator A
"tt" AM/PM designator AM
"tt*" AM/PM designator PM
"d" "0" day w/o leading zero 1
"dd" "00" day with leading zero 01
"ddd" short weekday name (abbreviation) Mon
"dddd" full weekday name Monday
"dddd*" full weekday name Monday
"M" "0" month w/o leading zero 2
"MM" "00" month with leading zero 02
"MMM" short month name (abbreviation) Feb
"MMMM" full month name Febuary
"MMMM*" full month name Febuary
"y" "0" two digit year (year % 100) w/o leading zero 0
"yy" "00" two digit year (year % 100) with leading zero 00
"yyy" "D3" year 2000
"yyyy" "D4" year 2000
"yyyyy" "D5" year 2000
...
"z" "+0;-0" timezone offset w/o leading zero -8
"zz" "+00;-00" timezone offset with leading zero -08
"zzz" "+00;-00" for hour offset, "00" for minute offset full timezone offset -07:30
"zzz*" "+00;-00" for hour offset, "00" for minute offset full timezone offset -08:00
"K" -Local "zzz", e.g. -08:00
-Utc "'Z'", representing UTC
-Unspecified ""
-DateTimeOffset "zzzzz" e.g -07:30:15
"g*" the current era name A.D.
":" time separator : -- DEPRECATED - Insert separator directly into pattern (eg: "H.mm.ss")
"/" date separator /-- DEPRECATED - Insert separator directly into pattern (eg: "M-dd-yyyy")
"'" quoted string 'ABC' will insert ABC into the formatted string.
'"' quoted string "ABC" will insert ABC into the formatted string.
"%" used to quote a single pattern characters E.g.The format character "%y" is to print two digit year.
"\" escaped character E.g. '\d' insert the character 'd' into the format string.
other characters insert the character into the format string.
Pre-defined format characters:
(U) to indicate Universal time is used.
(G) to indicate Gregorian calendar is used.
Format Description Real format Example
========= ================================= ====================== =======================
"d" short date culture-specific 10/31/1999
"D" long data culture-specific Sunday, October 31, 1999
"f" full date (long date + short time) culture-specific Sunday, October 31, 1999 2:00 AM
"F" full date (long date + long time) culture-specific Sunday, October 31, 1999 2:00:00 AM
"g" general date (short date + short time) culture-specific 10/31/1999 2:00 AM
"G" general date (short date + long time) culture-specific 10/31/1999 2:00:00 AM
"m"/"M" Month/Day date culture-specific October 31
(G) "o"/"O" Round Trip XML "yyyy-MM-ddTHH:mm:ss.fffffffK" 1999-10-31 02:00:00.0000000Z
(G) "r"/"R" RFC 1123 date, "ddd, dd MMM yyyy HH':'mm':'ss 'GMT'" Sun, 31 Oct 1999 10:00:00 GMT
(G) "s" Sortable format, based on ISO 8601. "yyyy-MM-dd'T'HH:mm:ss" 1999-10-31T02:00:00
('T' for local time)
"t" short time culture-specific 2:00 AM
"T" long time culture-specific 2:00:00 AM
(G) "u" Universal time with sortable format, "yyyy'-'MM'-'dd HH':'mm':'ss'Z'" 1999-10-31 10:00:00Z
based on ISO 8601.
(U) "U" Universal time with full culture-specific Sunday, October 31, 1999 10:00:00 AM
(long date + long time) format
"y"/"Y" Year/Month day culture-specific October, 1999
Fable does not support Globalization/Localization in general.
For localization support, we added DateFormat in Fable.PowerPack.
MangelMaxime
on 6 Oct 2018
There is also Fable.DateFunctions binding for date-fns that covers most functions and has localization support, although the formatting patterns are a bit different in date-fns
Also, it hasn't been ported to Fable 2 yet, but that should be easy to do
Edit: just ported to Fable 2 stable and it ready to use
Zaid-Ajaj
on 7 Oct 2018
Ah yes thank you for pointing this one too 馃槉
MangelMaxime
on 7 Oct 2018
Given that PowerPack was conveniently split into multiple libraries, is there a plan to split date formatting into its own library too? I tried looking for it thinking it may already be done, but didn't find anything.
anchann
on 29 Aug 2019
@anchann It has already be done: https://github.com/fable-compiler/fable-date
The package is called Fable.Date
MangelMaxime
on 29 Aug 2019
@MangelMaxime thank you!
anchann
on 29 Aug 2019
Is there documentation on how to use Fable.Date anywhere?
severisv
on 6 Jan 2020
It was a part of Fable.PowerPack so you can find the documentation here however, it seems like the styles is broken.
I created an issue https://github.com/fable-compiler/fable-date/issues/2
MangelMaxime
on 7 Jan 2020
Closing for now, please reopen if necessary.
alfonsogarciacaro
on 11 May 2021
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