Formal invitations follow a rule most everyday writing ignores: numbers are spelled out, not printed as digits. On a wedding invitation, "Saturday, the twenty-first of June" looks right; "Saturday, June 21" looks like a calendar reminder. The difference is small, but on a card people keep, it matters.
The date and the day
Spell out the day of the week, the date, and the year in full. "Saturday, the twenty-first of June, two thousand twenty-six" is the classic form. Note two details: the date takes an ordinal (twenty-first, not twenty-one), and the year is read as a phrase (two thousand twenty-six), never as "2026" and never as "twenty twenty-six" on a formal card. If the invitation is less formal, "Saturday, June 21, 2026" is acceptable — but once you choose the spelled-out style, stay consistent across the whole invitation.
The time
Times on invitations are also written in words, usually with "o'clock" or "half past". "At four o'clock in the afternoon" and "at half past six in the evening" are the standard forms. Avoid "4:00 PM" on a formal invitation; it belongs on a meeting invite, not a wedding card. If the ceremony starts at a quarter hour, write "at a quarter past five" rather than "5:15".
The year and the address
The year appears twice on many invitations — once in the date line and once in the reply-by date — and both should match in style. Street numbers are the exception: the venue address usually keeps its digits ("12 Rosewood Lane") because guests need to find the place, and postal addresses are read by machines, not people. The same goes for the RSVP date: "Kindly respond by the first of May" reads better than "by May 1", but either is fine as long as the main date line is spelled out.
The guest count and the small numbers
Numbers under ten are always spelled out on invitations ("two guests", "one plus one"), and so are round figures in the wording ("a dinner for fifty"). Larger counts that appear in the text — say, a seating note or a donation line — follow the same rule: spell them out if the sentence reads naturally that way. If a number looks awkward spelled out, rephrase the sentence instead of falling back to digits.
A quick checklist before printing
- Date: day, ordinal date, and year all in words.
- Time: "four o'clock", "half past six" — no digits, no AM/PM abbreviations.
- Address: digits are fine for the street number.
- Consistency: if the date is spelled out, the time and the RSVP date should be too.
The fastest way to check your wording is to read the invitation aloud. If a line sounds like something a person would say at a formal occasion, it is right. If it sounds like a text message, rewrite it. And if you are unsure about a tricky number — a year, a large guest count, a compound date — a free numbers-to-words converter like WordsForNumbers can spell it out for you in seconds, so the card that goes to print is the one you meant to send.
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