Overview
Pass an integer month to fetch Catholic celebrations for the current year. Each response includes the event rank, liturgical season, vestment color, and whether the date is a holy day of obligation. Paid plans can specify custom years and receive additional lectionary cycles, psalter weeks, and season boundary dates.
Live Test Liturgical Calendar Source →
Formula
One function covers the whole catalog: the first argument names the source, the rest are its inputs, and the "field" pair says which single value lands in the cell. Formulas covers the grammar that applies to all of them.
=VERVE("liturgicalcalendar", "field", "2026-01-01.0.id")=VERVE.CALL("liturgicalcalendar", "field", "2026-01-01.0.id")Inputs
Required inputs are positional, in the order below. Everything else is passed as a "name", value pair after them — the same shape as SUMIFS. Premium inputs are accepted on every plan but only take effect on plans that include them.
| Input | Type | Where it goes | Description |
|---|---|---|---|
monthOptional | integer | "month", value | The month to get Liturgical Calendar data for (default: current month) range 1–12 |
yearOptionalPremium | integer | "year", value | The year to get Liturgical Calendar data for (default: current year) range 1900–2100 |
Passing an option
=VERVE("liturgicalcalendar", "month", 2)=VERVE.CALL("liturgicalcalendar", "month", 2)What lands in your sheet
The "field" pair is what makes the formula resolve to one cell. Its value is a dot-path from the table below, so swapping it is how you pull a different value — one formula per column.
Seeing everything at once
Drop the "field" pair and the formula returns the whole response instead: two columns, field name on the left and value on the right, spilling from the cell you typed in.
=VERVE("liturgicalcalendar")=VERVE.CALL("liturgicalcalendar")Good for exploring, not for filling down
The second row's table would land on top of the first's, and every cell after the first reads #REF! (#SPILL! in Excel). Keep one per sheet, or name a field, and leave the cells below and to the right empty.
Response fields
Paths are relative to data. Each one is exactly what the "field" pair accepts, so swapping it is how you pull a different value into a cell. On a plan without a Premium field the cell reads #PREMIUM(field) rather than a value, so a locked field never looks like a real answer.
| Use as "field" | Type | Example cell value | Description |
|---|---|---|---|
2026-01-01 | array[1] | ||
2026-01-01.0.id | string | mary_mother_of_god | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-01.0.precedencePremium | string | GENERAL_SOLEMNITY_3 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-01.0.rank | string | SOLEMNITY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-01.0.isHolyDayOfObligation | boolean | true | Whether Catholics are obligated to attend Mass for this event |
2026-01-01.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-01.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-02 | array[1] | ||
2026-01-02.0.id | string | basil_the_great_and_gregory_nazianzen_bishops | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-02.0.precedencePremium | string | GENERAL_MEMORIAL_10 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-02.0.rank | string | MEMORIAL | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-02.0.isHolyDayOfObligation | boolean | false | Whether Catholics are obligated to attend Mass for this event |
2026-01-02.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-02.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-02.0.weekday | object | {…} | The plain weekday this date would otherwise observe; present when the listed event is a memorial or optional memorial that takes precedence over, or is offered as an alternative to, the ordinary weekday. When that same weekday is also listed as its own celebration on the date, this nested copy carries only the summary fields (id, precedence, rank, isHolyDayOfObligation, isOptional, colors) and the deeper weekday.* fields below are absent |
2026-01-02.0.weekday.id | string | christmas_time_january_2 | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-02.0.weekday.date | string | 2026-01-02 | |
2026-01-02.0.weekday.dateDef | object | {…} | |
2026-01-02.0.weekday.dateDef.dateFn | string | weekdayBeforeEpiphany | |
2026-01-02.0.weekday.dateDef.dateArgs | array | [2] | |
2026-01-02.0.weekday.dateDef.yearOffset | number | 0 | |
2026-01-02.0.weekday.dateExceptions | array | [] | |
2026-01-02.0.weekday.alternativeTransferDateDefs | array | [] | |
2026-01-02.0.weekday.precedencePremium | string | WEEKDAY_13 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-02.0.weekday.rank | string | WEEKDAY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-02.0.weekday.allowSimilarRankItems | boolean | false | |
2026-01-02.0.weekday.isHolyDayOfObligation | boolean | false | Whether Catholics are obligated to attend Mass for this event |
2026-01-02.0.weekday.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-02.0.weekday.i18nDef | array | ["seasons:christmas_time.before_epiphany",{"day":2}] | |
2026-01-02.0.weekday.seasons | array | ["CHRISTMAS_TIME"] | |
2026-01-02.0.weekday.periods | array | ["DAYS_BEFORE_EPIPHANY","CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"] | |
2026-01-02.0.weekday.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-02.0.weekday.commonsDef | array | [] | |
2026-01-02.0.weekday.martyrology | array | [] | |
2026-01-02.0.weekday.titles | array | [] | |
2026-01-02.0.weekday.calendar | object | {…} | |
2026-01-02.0.weekday.calendar.weekOfSeason | number | 2 | |
2026-01-02.0.weekday.calendar.dayOfSeason | number | 9 | |
2026-01-02.0.weekday.calendar.dayOfWeek | number | 5 | |
2026-01-02.0.weekday.calendar.nthDayOfWeekInMonth | number | 1 | |
2026-01-02.0.weekday.calendar.startOfSeason | string | 2025-12-25 | |
2026-01-02.0.weekday.calendar.endOfSeason | string | 2026-01-11 | |
2026-01-02.0.weekday.calendar.startOfLiturgicalYear | string | 2025-11-30 | |
2026-01-02.0.weekday.calendar.endOfLiturgicalYear | string | 2026-11-28 | |
2026-01-02.0.weekday.calendar.seasons | array | ["CHRISTMAS_TIME"] | |
2026-01-02.0.weekday.cycles | object | {…} | |
2026-01-02.0.weekday.cycles.properCycle | string | PROPER_OF_TIME | |
2026-01-02.0.weekday.cycles.sundayCycle | string | YEAR_A | |
2026-01-02.0.weekday.cycles.weekdayCycle | string | YEAR_2 | |
2026-01-02.0.weekday.cycles.psalterWeek | string | WEEK_1 | |
2026-01-02.0.weekday.fromCalendarId | string | ProperOfTime | |
2026-01-02.0.weekday.fromExtendedCalendars | array | [] | |
2026-01-03 | array[2] | ||
2026-01-03.0.id | string | christmas_time_january_3 | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-03.0.precedencePremium | string | WEEKDAY_13 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-03.0.rank | string | WEEKDAY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-03.0.isHolyDayOfObligation | boolean | false | Whether Catholics are obligated to attend Mass for this event |
2026-01-03.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-03.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-04 | array[1] | ||
2026-01-04.0.id | string | second_sunday_after_christmas | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-04.0.precedencePremium | string | UNPRIVILEGED_SUNDAY_6 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-04.0.rank | string | SUNDAY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-04.0.isHolyDayOfObligation | boolean | true | Whether Catholics are obligated to attend Mass for this event |
2026-01-04.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-04.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-05 | array[1] | ||
2026-01-05.0.id | string | christmas_time_january_5 | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-05.0.precedencePremium | string | WEEKDAY_13 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-05.0.rank | string | WEEKDAY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-05.0.isHolyDayOfObligation | boolean | false | Whether Catholics are obligated to attend Mass for this event |
2026-01-05.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-05.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
2026-01-06 | array[1] | ||
2026-01-06.0.id | string | epiphany_of_the_lord | Unique identifier naming the liturgical event; also labels the nested weekday object when one is present |
2026-01-06.0.precedencePremium | string | PROPER_OF_TIME_SOLEMNITY_2 | Liturgical rank precedence level that determines which of several events on the same date is actually observed |
2026-01-06.0.rank | string | SOLEMNITY | Liturgical rank classification of the event (e.g., WEEKDAY, MEMORIAL, FEAST, SOLEMNITY, SUNDAY) |
2026-01-06.0.isHolyDayOfObligation | boolean | true | Whether Catholics are obligated to attend Mass for this event |
2026-01-06.0.isOptional | boolean | false | Whether observing this event is left to choice rather than required, as with an optional memorial |
2026-01-06.0.colors | array | ["WHITE"] | Liturgical vestment colors worn for the event (e.g., PURPLE, WHITE, RED, GREEN) |
When a cell doesn't fill
A failed lookup returns readable text starting with #ERR rather than a spreadsheet error, because Excel cannot show a custom message on a real error — you would get a bare #VALUE! with no reason. The trade-off is that IFERROR() will not catch it; test with LEFT(cell, 4) = "#ERR" instead. Error handling covers the rest.
| Cell reads | What happened |
|---|---|
#ERR Not connected | No API key saved. Open the side panel and connect your account. |
#ERR Replace <name> with a cell or value | A preview formula was copied as-is. Swap the placeholder for a cell reference. |
#ERR No "x" in liturgicalcalendar | An option name this source does not take. The message lists the ones it does. |
#ERR No data point "…" | The "field" path is not in the response. Check it against the table above. |
#PREMIUM(field) | The field exists but your plan does not include it. |
#ERR Out of credits | The cycle's credits are spent. Usage resets on your billing date. |
Before the formula works
The add-in reads the API key you saved once in the side panel — the key never goes in the formula, so a shared sheet does not leak it and a collaborator without access simply sees the last calculated values.
- Install the add-in for Google Sheets or Excel.
- Open the side panel and sign in, or paste a key from your dashboard.
- Type the formula above into any cell.
Use cases
- Church Bulletin Publishing
- When preparing weekly parish bulletins, church administrators pull upcoming feast ranks and vestment colors to format worship aids accurately.
- Daily Missal Apps
- Mobile prayer apps display daily commemorations and required vestment colors to orient users within the current Catholic season.
- Sacristy Vestment Planning
- To prepare altar paraments and priest vestments ahead of time, sacristans check the required liturgical color for upcoming celebrations.
- Catholic School Scheduling
- School administrators schedule all-school masses by checking which upcoming dates qualify as holy days of obligation.
Other ways to use Liturgical Calendar
Set up Liturgical Calendar on VerveSheets, or reach the same source a different way. Your VerveSheets account and credits work on all of them — one key, one balance.
Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →
Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →
Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →
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