CLDR-17892 ISO 8601 calendar (#4037)

docs/site/downloads/cldr-46.md

@@ -66,9 +66,13 @@ For a full listing, see [Delta DTDs](https://unicode.org/cldr/charts/46/suppleme
 
 1. Currency
     1. New currency code `ZWG` added — because it was late in the cycle, many locales will just support the code (no symbol or name).
-2. Timezones and Metazones
-    1. Changed the metazone for Kazakhstan to reflect removal of Asia/Almaty, thus dropping the distinction among different regions in Kazakhstan.
-    2. Added support for deprecated codes by remapping: `CST6CDT → America/Chicago`, `EST → America/Panama`, `EST5EDT → America/New_York`, `MST7MDT → America/Denver`, `PST8PDT → America/Los_Angeles`.
+2. Dates & Times
+    1. Added a new calendar type, `iso8601`.
+This is not the same as the [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) standard format, which is designed just for data interchange:
+it is all ASCII, doesn't have all the options for fields (like "Sunday", "BC", or "AM"), and does not contain spaces.
+The CLDR `iso8601` calendar uses patterns in the order: era, year, month, day, day-of-week, hour, minute, second, day-period, timezone 
+	2. Changed the metazone for Kazakhstan to reflect removal of Asia/Almaty, thus dropping the distinction among different regions in Kazakhstan.
+    3. Added support for deprecated timezone codes by remapping: `CST6CDT → America/Chicago`, `EST → America/Panama`, `EST5EDT → America/New_York`, `MST7MDT → America/Denver`, `PST8PDT → America/Los_Angeles`.
 3. Units
     1. Added units: `portion-per-1e9` (aka per-billion), `night` (for hotel stays), `light-speed` (as an internal prefix for **light-second**, **light-minute**, etc.)
     2. Changed preferred wind speed preference for some locales to `meter-per-second`.
@@ -112,7 +116,11 @@ For a full listing, see [¤¤BCP47 Delta](https://unicode.org/cldr/charts/46/del
 
 1. Major changes to emoji search keywords and short names (see below)
 2. Major changes to Chinese collation, reflecting new data in Unicode 16.0
-3. Other changes
+3. Added iso8601 patterns to root. 
+These will use localized months, days of the week, day periods, and timezones.
+In this first version, the separators are not localized, and will use "-" within numeric dates, ":" within times, and " " or ", " between major elements.
+Full localization will await the next submission phase for CLDR.
+4. Other changes
     1. Various locales also had smaller improvements agreed to by translators.
     2. Additional test files have been added.
 

tools/cldr-code/src/main/java/org/unicode/cldr/util/PathHeader.java

@@ -189,6 +189,7 @@ public enum PageId {
         Fields(SectionId.DateTime),
         Relative(SectionId.DateTime),
         Gregorian(SectionId.DateTime),
+        ISO8601(SectionId.DateTime, "ISO 8601"),
         Generic(SectionId.DateTime),
         Buddhist(SectionId.DateTime),
         Chinese(SectionId.DateTime),

tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/PathHeader.txt

@@ -119,11 +119,14 @@
 //ldml/dates/calendars/calendar[@type="%A"]/dateTimeFormats/availableFormats/dateFormatItem[@id="%A"][@alt="ascii"]             ; Special  ; Suppress ; &calendar($1); &calField(Formats:Flexible:date)-$2-ascii ; HIDE
 //ldml/dates/calendars/calendar[@type="gregorian"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*(a|b|B)*[h]%a)"]     ; DateTime ; &calendar(gregorian); &calField(Formats:Flexible:time12) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="gregorian"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*[Hms]%a)"]           ; DateTime ; &calendar(gregorian); &calField(Formats:Flexible:time24) ; $1 ; LTR_ALWAYS
+//ldml/dates/calendars/calendar[@type="iso8601"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*(a|b|B)*[h]%a)"]     ; DateTime ; &calendar(iso8601); &calField(Formats:Flexible:time12) ; $1 ; LTR_ALWAYS
+//ldml/dates/calendars/calendar[@type="iso8601"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*[Hms]%a)"]           ; DateTime ; &calendar(iso8601); &calField(Formats:Flexible:time24) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="generic"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*(a|b|B)*[h]%a)"]       ; DateTime ; &calendar(generic); &calField(Formats:Flexible:time12) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="generic"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*[Hms]%a)"]             ; DateTime ; &calendar(generic); &calField(Formats:Flexible:time24) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="chinese"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*(a|b|B)*[h]%a)"]       ; DateTime ; &calendar(chinese); &calField(Formats:Flexible:time12) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="chinese"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(E*[Hms]%a)"]             ; DateTime ; &calendar(chinese); &calField(Formats:Flexible:time24) ; $1 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="gregorian"]/dateTimeFormats/availableFormats/dateFormatItem[@id="%A"][@count="%A"]       ; DateTime ; &calendar(gregorian); &calField(Formats:Flexible:date) ; $1-$2 ; LTR_ALWAYS
+//ldml/dates/calendars/calendar[@type="iso8601"]/dateTimeFormats/availableFormats/dateFormatItem[@id="%A"][@count="%A"]       ; DateTime ; &calendar(iso8601); &calField(Formats:Flexible:date) ; $1-$2 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="%N"]/dateTimeFormats/availableFormats/dateFormatItem[@id="(?![^"]*[hHms])%A"]            ; DateTime ; &calendar($1); &calField(Formats:Flexible:date) ; $2 ; LTR_ALWAYS
 //ldml/dates/calendars/calendar[@type="%A"]/dateTimeFormats/availableFormats/dateFormatItem[@id="%A"][@count="%A"]              ; Special  ; Suppress ; &calendar($1); &calField(Formats:Flexible:date)-$2-$3 ; HIDE
 //ldml/dates/calendars/calendar[@type="%A"]/dateTimeFormats/availableFormats/dateFormatItem[@id="%A"]                           ; Special  ; Suppress ; &calendar($1); &calField(Formats:Flexible:date)-$2 ; HIDE

tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/Placeholders.txt

@@ -11,7 +11,8 @@
 
 ^//ldml/dates/calendars/calendar\[@type="%A"]/dateTimeFormats/dateTimeFormatLength\[@type="%A"]/dateTimeFormat\[@type="%A"]/pattern\[@type="%A"] ; {1}=DATE Dec 10, 2010 ; {0}=TIME 3:59
 
-# strange values
+# The code does not currently allow for showing the placeholders in datetime formats
+
 #^//ldml/dates/.*(pattern|available|intervalFormatItem) ; cccc=UNKNOWN ?
 #^//ldml/dates/.*(pattern|available|intervalFormatItem) ; ccc=UNKNOWN ?
 #

tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestCLDRFile.java

@@ -192,6 +192,7 @@ public void testExtraPaths() {
                                     || path.contains("/gender")
                                     || path.startsWith("//ldml/numbers/currencies/currency")
                                     || path.startsWith("//ldml/personNames/sampleName")
+                                    || path.contains("/availableFormats")
                             ? PlaceholderStatus.DISALLOWED
                             : path.contains("/compoundUnitPattern1")
                                     ? PlaceholderStatus.REQUIRED