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Calendar Date Speller

Spell out any calendar date in words. Convert numeric dates to written format: formal, ordinal, AP style, and more. Free online date speller tool.

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About

Written date formats vary across legal documents, formal correspondence, academic papers, and journalism. Using January 1st, 2025 versus the First of January, Two Thousand Twenty-Five versus 1 Jan 2025 carries distinct implications for formality, locale compliance, and legal validity. Errors in date formatting on contracts or checks can void instruments or create ambiguity in court proceedings. This tool converts any numeric date into multiple spelled-out textual representations, covering ordinal, cardinal, AP Stylebook, formal legal, and verbose formats. It handles years from 0001 to 9999 and accounts for leap year validation on February 29. Note: spelling conventions shown follow American English defaults. British English reverses day-month order in most formats.

date speller date in words spell out date date to text written date format ordinal date formal date

Formulas

Ordinal suffix selection follows a deterministic rule based on the day number d:

{
suffix = "st" if d mod 10 = 1 ∧ d ≠ 11suffix = "nd" if d mod 10 = 2 ∧ d ≠ 12suffix = "rd" if d mod 10 = 3 ∧ d ≠ 13suffix = "th" otherwise

Where d = day of the month (1 - 31). The exceptions for 11, 12, 13 prevent incorrect forms like "11st" or "13rd".

Leap year validation uses the Gregorian rule for year y:

isLeap = (y mod 4 = 0) ∧ (y mod 100 ≠ 0 ∨ y mod 400 = 0)

Number-to-words conversion decomposes the year into thousands, hundreds, tens, and ones groups, recursively building the English word representation. Years like 1900 become "Nineteen Hundred" while 2025 becomes "Two Thousand Twenty-Five."

Reference Data

Format NameExample OutputTypical Use Case
Formal OrdinalJanuary 1st, 2025Business letters, invitations
Full WrittenJanuary First, Two Thousand Twenty-FiveLegal documents, checks
Day-First Ordinal1st January 2025British/International correspondence
Verbose FormalThe First Day of January in the Year Two Thousand Twenty-FiveContracts, deeds, proclamations
AP StyleJan. 1, 2025Journalism, news articles
Day of Week FullWednesday, January 1st, 2025Event announcements, memos
Cardinal (No Ordinal)January 1, 2025Chicago Manual of Style
ISO Verbose2025, January the FirstTechnical logs, archival records
Words Only (No Numerals)The First of January, Twenty Twenty-FiveFormal spoken / ceremonial
Military/NATO01 January 2025Military orders, government documents
Numeric ISO 86012025-01-01Databases, APIs, international standard
Fiscal QuarterQ1 2025Financial reporting
Ordinal Day of YearDay 1 of 365 in 2025Agricultural, scientific logs
Academic1 January 2025Citations (APA, MLA)
Check/Cheque LineJanuary First, Two Thousand Twenty-FiveBank instruments

Frequently Asked Questions

The numbers 11, 12, and 13 are explicit exceptions. Despite ending in 1, 2, and 3 respectively, English convention requires the suffix "th" for all teen numbers. The algorithm checks if the day falls in the 11-13 range before applying the standard modulo-10 rule, preventing outputs like "11st" or "13rd."
Legal instruments typically require the "Full Written" or "Verbose Formal" format where both the day and year are spelled entirely in words. This prevents alteration of numeric digits. For example, "January First, Two Thousand Twenty-Five" is standard on checks in the United States. Some jurisdictions require the numeric date in parentheses after the written form for disambiguation.
Yes. The Gregorian leap year rule is applied: a year divisible by 4 is a leap year, except centuries (divisible by 100) which must also be divisible by 400. So 2024 is a leap year, 1900 is not, and 2000 is. Selecting February 29 on a non-leap year triggers a validation error.
AP (Associated Press) Stylebook abbreviates months with more than five letters (Jan., Feb., Aug., Sept., Oct., Nov., Dec.) and uses cardinal numbers without ordinal suffixes: "Jan. 1, 2025." Chicago Manual of Style spells months in full and also uses cardinal numbers: "January 1, 2025." Neither style uses ordinal suffixes like "1st" in running text.
Convention treats years 1100-1999 as pairs of two-digit numbers: 1999 becomes "Nineteen Ninety-Nine" and 1776 becomes "Seventeen Seventy-Six." Years 2000-2009 use "Two Thousand" plus the ones word ("Two Thousand Nine"). From 2010 onward, both forms are acceptable: "Twenty Twenty-Five" or "Two Thousand Twenty-Five." This tool outputs both conventions where applicable.
Yes. The day-of-year is computed by summing the days of all preceding months (using the standard 31/28-or-29/31/30 pattern) and adding the current day. For example, March 1 is day 60 in non-leap years and day 61 in leap years. The total days in year is 365 or 366 accordingly.