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apiverve / liturgicalcalendar
Liturgical Calendar is a simple tool for getting the dates of the Liturgical Calendar. It returns the dates of the Liturgical Calendar for a given year.
Maintainers
Package info
github.com/apiverve/liturgicalcalendar-api
Language:Java
pkg:composer/apiverve/liturgicalcalendar
dev-main
2026-07-16 20:40 UTC
Requires
- php: >=7.4
- guzzlehttp/guzzle: ^7.0
Requires (Dev)
- phpunit/phpunit: ^9.0
This package is not auto-updated.
Last update: 2026-07-17 00:11:23 UTC
README
Liturgical Calendar is a simple tool for getting the dates of the Liturgical Calendar. It returns the dates of the Liturgical Calendar for a given year.
The Liturgical Calendar API provides a simple, reliable way to integrate liturgical calendar functionality into your applications. Built for developers who need production-ready liturgical calendar capabilities without the complexity of building from scratch.
Available on:
Quick Start
Using JavaScript
async function callLiturgicalCalendarAPI() { try { const params = new URLSearchParams({ month: 2 }); const response = await fetch(`https://api.apiverve.com/v1/liturgicalcalendar?${params}`, { method: 'GET', headers: { 'x-api-key': 'YOUR_API_KEY_HERE' } }); const data = await response.json(); console.log(data); } catch (error) { console.error('Error:', error); } } callLiturgicalCalendarAPI();
Using cURL
curl -X GET "https://api.apiverve.com/v1/liturgicalcalendar?month=2" \ -H "x-api-key: YOUR_API_KEY_HERE"
Get your API key: https://apiverve.com
📁 For more examples, see the examples folder
Installation
Choose your preferred programming language:
📦 NPM (JavaScript/Node.js)
npm install @apiverve/liturgicalcalendar
View NPM Package → | Package Code →
🔷 NuGet (.NET/C#)
dotnet add package APIVerve.API.LiturgicalCalendar
View NuGet Package → | Package Code →
🐍 Python (PyPI)
pip install apiverve-liturgicalcalendar
View PyPI Package → | Package Code →
💎 Ruby (RubyGems)
gem install apiverve_liturgicalcalendar
View RubyGems Package → | Package Code →
🐘 PHP (Packagist)
composer require apiverve/liturgicalcalendar
View Packagist Package → | Package Code →
🎯 Dart (pub.dev)
dart pub add apiverve_liturgicalcalendar
View pub.dev Package → | Package Code →
🤖 Android (JitPack)
implementation 'com.github.apiverve:liturgicalcalendar-api:1.0.0'
🐹 Go
go get github.com/apiverve/liturgicalcalendar-api/go
Why Use This API?
| Feature | Benefit |
|---|---|
| Multi-language SDKs | Native packages for JavaScript, Python, C#, Go, and Android |
| Simple Integration | Single API key authentication, consistent response format |
| Production Ready | 99.9% uptime SLA, served from 24 global regions |
| Comprehensive Docs | Full examples, OpenAPI spec, and dedicated support |
Documentation
- 🏠 API Home: Liturgical Calendar API
- 📚 API Reference: docs.apiverve.com/ref/liturgicalcalendar
- 📖 OpenAPI Spec: openapi.yaml
- 💡 Examples: examples/
What Can You Build?
The Liturgical Calendar API is commonly used for:
- Web Applications - Add liturgical calendar features to your frontend or backend
- Mobile Apps - Native SDKs for Android development
- Automation - Integrate with n8n, Zapier, or custom workflows
- SaaS Products - Enhance your product with liturgical calendar capabilities
- Data Pipelines - Process and analyze data at scale
API Reference
Authentication
All requests require an API key in the header:
x-api-key: YOUR_API_KEY_HERE
Get your API key: https://apiverve.com
Response Format
Every APIVerve endpoint returns the same envelope — check status, then read data:
{
"status": "ok",
"error": null,
"data": { ... }
}
Example Response
A real response from the Liturgical Calendar API:
{
"status": "ok",
"error": null,
"data": {
"2025-12-01": [
{
"id": "advent_1_monday",
"date": "2025-12-01",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
1,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 1
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 2,
"dayOfWeek": 1,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
],
"2025-12-02": [
{
"id": "advent_1_tuesday",
"date": "2025-12-02",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
2,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 2
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 3,
"dayOfWeek": 2,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
],
"2025-12-03": [
{
"id": "francis_xavier_priest",
"date": "2025-12-03",
"dateDef": {
"month": 12,
"date": 3
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"names:francis_xavier_priest"
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"WHITE"
],
"commonsDef": [
"None"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 4,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_SAINTS",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ma",
"fromExtendedCalendars": [],
"weekday": {
"id": "advent_1_wednesday",
"date": "2025-12-03",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
3,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 3
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 4,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2025-12-04": [
{
"id": "advent_1_thursday",
"date": "2025-12-04",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
4,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 4
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 5,
"dayOfWeek": 4,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
},
{
"id": "john_damascene_priest",
"date": "2025-12-04",
"dateDef": {
"month": 12,
"date": 4
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": true,
"i18nDef": [
"names:john_damascene_priest"
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"WHITE"
],
"commonsDef": [
"Pastors",
"DoctorsOfTheChurch"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 5,
"dayOfWeek": 4,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_SAINTS",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ma",
"fromExtendedCalendars": [],
"weekday": {
"id": "advent_1_thursday",
"date": "2025-12-04",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
4,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 4
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 5,
"dayOfWeek": 4,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2025-12-05": [
{
"id": "advent_1_friday",
"date": "2025-12-05",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
5,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 5
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 6,
"dayOfWeek": 5,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
],
"2025-12-06": [
{
"id": "advent_1_saturday",
"date": "2025-12-06",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
6,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 6
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 7,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
},
{
"id": "nicholas_of_myra_bishop",
"date": "2025-12-06",
"dateDef": {
"month": 12,
"date": 6
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": true,
"i18nDef": [
"names:nicholas_of_myra_bishop"
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"WHITE"
],
"commonsDef": [
"Bishops"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 7,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_SAINTS",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ma",
"fromExtendedCalendars": [],
"weekday": {
"id": "advent_1_saturday",
"date": "2025-12-06",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
6,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 1,
"dow": 6
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 7,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2025-12-07": [
{
"id": "advent_2_sunday",
"date": "2025-12-07",
"dateDef": {
"dateFn": "sundayOfAdvent",
"dateArgs": [
2
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "PRIVILEGED_SUNDAY_2",
"rank": "SUNDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": true,
"isOptional": false,
"i18nDef": [
"seasons:advent.sunday",
{
"week": 2
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 8,
"dayOfWeek": 0,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_2"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
],
"2025-12-08": [
{
"id": "immaculate_conception_of_the_blessed_virgin_mary",
"date": "2025-12-08",
"dateDef": {
"dateFn": "immaculateConceptionOfMary"
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "GENERAL_SOLEMNITY_3",
"rank": "SOLEMNITY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": true,
"isOptional": false,
"i18nDef": [
"names:immaculate_conception_of_the_blessed_virgin_mary"
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"WHITE"
],
"commonsDef": [
"None"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 9,
"dayOfWeek": 1,
"nthDayOfWeekInMonth": 2,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_SAINTS",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_2"
},
"fromCalendarId": "ma",
"fromExtendedCalendars": []
}
],
"2025-12-09": [
{
"id": "advent_2_tuesday",
"date": "2025-12-09",
"dateDef": {
"dateFn": "unprivilegedWeekdayOfAdvent",
"dateArgs": [
2,
2
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:advent.weekday",
{
"week": 2,
"dow": 2
}
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"PURPLE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 10,
"dayOfWeek": 2,
"nthDayOfWeekInMonth": 2,
"startOfSeason": "2025-11-30",
"endOfSeason": "2025-12-24",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ADVENT"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_2"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
},
{
"id": "juan_diego_cuauhtlatoatzin",
"date": "2025-12-09",
"dateDef": {
"month": 12,
"date": 9
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": true,
"i18nDef": [
"names:juan_diego_cuauhtlatoatzin"
],
"seasons": [
"ADVENT"
],
"periods": [],
"colors": [
"WHITE"
],
"commonsDef": [
"Saints"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 10,
"dayOfWeek": 2,
"nthDayOfWeekInMonth": 2,
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"dateDef": {
"dateFn": "weekdayWithinOctaveOfChristmas",
"dateArgs": [
5
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "PRIVILEGED_WEEKDAY_9",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:christmas_time.octave",
{
"count": 5
}
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"CHRISTMAS_OCTAVE",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [
"WHITE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 5,
"dayOfWeek": 1,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2025-12-30": [
{
"id": "christmas_octave_day_6",
"date": "2025-12-30",
"dateDef": {
"dateFn": "weekdayWithinOctaveOfChristmas",
"dateArgs": [
6
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "PRIVILEGED_WEEKDAY_9",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:christmas_time.octave",
{
"count": 6
}
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"CHRISTMAS_OCTAVE",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [
"WHITE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 6,
"dayOfWeek": 2,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
],
"2025-12-31": [
{
"id": "christmas_octave_day_7",
"date": "2025-12-31",
"dateDef": {
"dateFn": "weekdayWithinOctaveOfChristmas",
"dateArgs": [
7
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "PRIVILEGED_WEEKDAY_9",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:christmas_time.octave",
{
"count": 7
}
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"CHRISTMAS_OCTAVE",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [
"WHITE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 7,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
},
{
"id": "sylvester_i_pope",
"date": "2025-12-31",
"dateDef": {
"month": 12,
"date": 31
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": true,
"i18nDef": [
"names:sylvester_i_pope"
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"CHRISTMAS_OCTAVE",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [],
"commonsDef": [
"PopeOrBishop"
],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 7,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_SAINTS",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ma",
"fromExtendedCalendars": [],
"weekday": {
"id": "christmas_octave_day_7",
"date": "2025-12-31",
"dateDef": {
"dateFn": "weekdayWithinOctaveOfChristmas",
"dateArgs": [
7
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "PRIVILEGED_WEEKDAY_9",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:christmas_time.octave",
{
"count": 7
}
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"CHRISTMAS_OCTAVE",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [
"WHITE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 7,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
]
}
}
Support & Community
- 🏠 API Home: Liturgical Calendar API
- 💬 Support: https://apiverve.com/contact
- 🐛 Issues: GitHub Issues
- 📖 Documentation: https://docs.apiverve.com
- 🌐 Website: https://apiverve.com
Contributing
We welcome contributions! Please see CONTRIBUTING.md for guidelines.
Security
For security concerns, please review our Security Policy.
License
This project is licensed under the MIT License - see the LICENSE file for details.
Acknowledgments
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