How to Read Your Passport: Which Date Actually Matters

You are halfway through an online entry application at eleven at night. It wants the passport number, the date of issue, the issuing authority and the expiry date, for four people. You open the first booklet and find two dates printed one above the other in identical formatting, neither of them obviously labelled in English.

Most of us have never had to read a passport properly. We know roughly where the expiry date lives and we take the rest on trust. That works right up until a form, a border officer or an airline asks something specific, and then the difference between two very similar-looking dates starts to matter quite a lot.

The Two Dates, and What Each One Controls

Your data page carries a date of issue and a date of expiry, and they do completely different jobs.

The date of issue is the day the booklet was produced. It starts the clock: ten years for most adult passports, five for most children’s. It is also the date that a handful of entry rules look at directly, which surprises people who assume it is just administrative trivia.

The date of expiry is the hard stop, and it is what the familiar validity rules measure. When a country asks for six months of remaining validity, it is counting six months back from the expiry date to the day you arrive. Our guide to the 6-month passport rule goes through which countries enforce it.

If you take one thing from the page, take that asymmetry: the issue date describes the document, and the expiry date describes how long you can still travel on it.

Why Your Passport Might Say "Expedition"

Plenty of people search for what "date of expedition" means on a passport, and the answer is reassuringly dull: it means date of issue.

The phrase comes out of Spanish and Portuguese. Fecha de expedición and data de expedição both translate literally into English as expedition date, and translated forms carry that wording across without anyone catching it. The same field appears as date de délivrance in French, data di rilascio in Italian, Ausstellungsdatum in German, datum van afgifte in Dutch and utfärdandedatum in Swedish.

All of them mean the same thing, and none of them mean expiry. If a form asks for an expedition date, it wants the earlier of your two dates.

The Date Format Is Built to Stop Exactly This

Look closely and you will notice that many passports do not print their dates as numbers alone. The month is generally given as letters rather than digits.

There is a good reason for the awkwardness. Written purely in digits, 03/04/26 is the third of April across most of the world and the fourth of March in the United States. A border officer glancing at a document cannot afford that ambiguity, and a spelled-out month removes it.

The ambiguity comes back the moment you transcribe the date into a form, because forms do use digits. Before you type anything, check whether the field wants DD/MM/YYYY or MM/DD/YYYY, and check it again for the second passport rather than assuming the form remembered. A rejected application usually costs a fee and a wait, and a day and a month swapping places is an easy way to trigger one.

Four Passports, Four Different Clocks

All of this multiplies quietly in a family. Passports tend to be issued when they are needed rather than together, so the issue dates in one house rarely line up, and the expiry dates do not either.

Children make the spread wider. Most children’s passports run half the length of an adult’s, so a booklet issued in the same month as a parent’s runs out roughly five years earlier. Parents with years of validity in hand are the ones most likely to be caught by a child’s document, because there is no reason to think about it until a form asks. We go through how to keep a household’s worth of these straight in managing several passports at once.

The Ten-Year Passport That Is Not Valid for Ten Years

The issue date stops being trivia the moment a country checks it directly. Passport offices used to roll unused months from an expiring passport onto its replacement, so a renewed booklet could run for ten years and a few extra months, which looked generous at the time.

British passports issued more recently no longer carry those extra months, but older booklets holding them are still in circulation and still in use.

Schengen countries apply two separate tests to a non-EU passport at the border: it must have been issued less than ten years before the date you arrive, and it must stay valid for at least three months after you intend to leave. A booklet carrying nine extra months can satisfy the second test comfortably and fail the first, which is a difficult conversation to have at a desk in Madrid with a document that has not expired.

Check both dates before a European trip, not just the one at the bottom.

Issuing Country and Issuing Authority Are Different Fields

Near the top of the data page sits a three-letter code for the issuing country. Further down, usually in its own field, sits the issuing authority: the office or department that actually produced the booklet.

The country matters more than people expect. It decides whose consular network you turn to when a passport is lost or stolen, and that is rarely the country you happen to be standing in. It also decides which entry rules apply to you, which is the whole reason dual nationals think carefully about which passport they present. If you want the practical version of that, we walk through it in what to do when a passport goes missing abroad.

The authority field is mostly useful for forms. Some applications want it verbatim, some accept the country, and copying it exactly is faster than guessing.

The Passport Number Changes. What Is Attached to It Does Not.

A renewal generally issues a new number, and nothing already pointing at the old one updates on its own.

Visas already stamped or printed into the previous passport stay there, and flights booked before the renewal still carry the old number too. Airline loyalty profiles, trusted-traveller memberships and stored traveller details on booking sites all sit on whatever number was current when you filled them in.

None of that is dramatic on its own. It becomes dramatic when a boarding pass and a passport disagree at a check-in desk, so it is worth a slow half hour after a renewal to update the handful of places that hold the number.

Where All of This Sits on the Page

The data page is the stiff laminated one carrying your photograph, and its layout is standardised internationally rather than invented by each country. That is why a passport from anywhere is legible to a border officer anywhere, and why once you can read one you can read all of them.

The two lines of characters and chevrons across the bottom are the machine-readable zone. It restates some of the page above it in a form a scanner can take in one pass, though not all of it: the expiry date is in there, the issue date is not. Damage down there is treated far more seriously than a scuff on the cover. We cover where that line falls in travelling with a damaged passport.

If the labels on your own data page are not in English, the geometry still helps: the two dates are printed together, in the same format, and the expiry date is the later of the two.

Before you rely on this: it’s a blog, not an official source. Rules and details change, and your situation may be different. We check what we publish, and we can still be wrong or out of date. If something here matters to your plans, confirm it with the authority that handles it before you act.