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diff --git a/languages/i18n/datetime/cy.json b/languages/i18n/datetime/cy.json
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+++ b/languages/i18n/datetime/cy.json
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+{
+	"@metadata": {
+		"authors": [
+			"Ceirios",
+			"Lloffiwr",
+			"Robin Owain"
+		]
+	},
+	"january": "Ionawr",
+	"february": "Chwefror",
+	"march": "Mawrth",
+	"april": "Ebrill",
+	"may_long": "Mai",
+	"june": "Mehefin",
+	"july": "Gorffennaf",
+	"august": "Awst",
+	"september": "Medi",
+	"october": "Hydref",
+	"november": "Tachwedd",
+	"december": "Rhagfyr",
+	"january-gen": "Ionawr",
+	"february-gen": "Chwefror",
+	"march-gen": "Mawrth",
+	"april-gen": "Ebrill",
+	"may-gen": "Mai",
+	"june-gen": "Mehefin",
+	"july-gen": "Gorffennaf",
+	"august-gen": "Awst",
+	"september-gen": "Medi",
+	"october-gen": "Hydref",
+	"november-gen": "Tachwedd",
+	"december-gen": "Rhagfyr",
+	"jan": "Ion",
+	"feb": "Chwe",
+	"mar": "Maw",
+	"apr": "Ebr",
+	"may": "Mai",
+	"jun": "Meh",
+	"jul": "Gor",
+	"aug": "Awst",
+	"sep": "Medi",
+	"oct": "Hyd",
+	"nov": "Tach",
+	"dec": "Rhag",
+	"monday": "Dydd Llun",
+	"tuesday": "Dydd Mawrth",
+	"wednesday": "Dydd Mercher",
+	"thursday": "Dydd Iau",
+	"friday": "Dydd Gwener",
+	"saturday": "Dydd Sadwrn",
+	"sunday": "Dydd Sul",
+	"mon": "Llun",
+	"tue": "Maw",
+	"wed": "Mer",
+	"thu": "Iau",
+	"fri": "Gwe",
+	"sat": "Sad",
+	"sun": "Sul",
+	"period-am": "AM",
+	"period-pm": "PM",
+	"timezone-local": "Lleol",
+	"years": "{{PLURAL:$1|$1 blwyddyn|blwyddyn|$1 flynedd|$1 blynedd|$1 blynedd|$1 mlynedd}}",
+	"months": "{{PLURAL:$1|$1 mis|mis|deufis|$1 mis}}",
+	"weeks": "{{PLURAL:$1|$1 wythnos|$1 wythnosau}}",
+	"days": "{{PLURAL:$1||$1 diwrnod|$1 ddiwrnod|$1 diwrnod|$1 diwrnod|$1 diwrnod}}",
+	"hours": "{{PLURAL:$1|$1 awr}}",
+	"minutes": "{{PLURAL:$1||$1 munud|$1 funud|$1 munud|$1 munud|$1 munud}}",
+	"seconds": "{{PLURAL:$1|$1 eiliad}}",
+	"hours-abbrev": "$1a",
+	"minutes-abbrev": "$1m",
+	"seconds-abbrev": "$1e",
+	"ago": "$1 yn ôl",
+	"duration-millennia": "$1 {{PLURAL:$1|milflwydd|filflwydd|filflwydd|milflwydd|milflwydd|milflwydd}}",
+	"duration-centuries": "$1 {{PLURAL:$1|canmlwydd|ganmlwydd|ganmlwydd|canmlwydd|chanmlwydd|canmlwydd}}",
+	"duration-decades": "$1 {{PLURAL:$1|degawd|degawd|ddegawd|degawd|degawd|degawd}}",
+	"duration-years": "$1 {{PLURAL:$1|mlynedd|mlynedd|flynedd|mlynedd|mlynedd|mlynedd}}",
+	"duration-months": "$1 {{PLURAL:$1|mis|mis|fis|mis}}",
+	"duration-weeks": "$1 {{PLURAL:$1|wythnos}}",
+	"duration-days": "$1 {{PLURAL:$1|diwrnod|diwrnod|ddiwrnod|diwrnod}}",
+	"duration-hours": "$1 {{PLURAL:$1|awr}}",
+	"duration-minutes": "$1 {{PLURAL:$1|munud|munud|funud|munud|munud|munud}}",
+	"duration-seconds": "$1 {{PLURAL:$1|eiliad}}",
+	"monday-at": "Dydd Llun am $1",
+	"tuesday-at": "Dydd Mawrth am $1",
+	"wednesday-at": "Dydd Mercher am $1",
+	"thursday-at": "Dydd Iau am $1",
+	"friday-at": "Dydd Gwener am $1",
+	"saturday-at": "Dydd Sadwrn am $1",
+	"sunday-at": "Dydd Sul am $1",
+	"yesterday-at": "Ddoe am $1",
+	"hours-ago": "$1 {{PLURAL:$1|awr}} yn ôl",
+	"minutes-ago": "$1 {{PLURAL:$1|munud|munud|funud|munud}} yn ôl",
+	"seconds-ago": "$1 {{PLURAL:$1|eiliad}} yn ôl",
+	"just-now": "nawr"
+}