How to Cite a Source With No Date

When a source has no publication date, you replace the year with a no-date marker, such as the abbreviation for no date, in the spot where the year normally goes. Many styles also ask you to add the date you accessed the source, since undated material can change over time.

Why a source might have no date

Undated sources are common online. Many web pages, static company pages, some reports, and older documents do not show a publication or update date anywhere. A missing date does not stop you from citing the source. It changes what you put in the date position and often adds an access date so readers know when you viewed it.

The core rule: use a no-date marker

Author-date styles need something in the date slot so the citation still works. When no date exists, you put a standard no-date marker there instead of a year. This keeps the structure of both your in-text citation and your full reference intact: the marker sits exactly where the year would, so the short form and the long form still match.

In your in-text citation, that means pairing the author or title with the no-date marker rather than a year. In your reference list, the same marker fills the date element, and the rest of the entry follows the normal pattern for that source type.

Add an access date for changeable sources

For online sources that can change, most styles ask you to record the date you accessed the material. This matters most when there is no publication date, because the access date becomes the reader's only time reference. It tells them which version of a living page you actually saw, which is important if the content is later edited or removed.

The access date usually goes near the URL at the end of the reference. Where exactly it sits, and how it is worded, depends on the style, so let a generator place it correctly once you enter it.

Check carefully before deciding there is no date

Dates are often present but hidden. Before you fall back to the no-date marker, look in these places:

• The top or bottom of the page, where a published or updated date is often shown.
• A copyright line in the footer, which can give at least a year.
• The article byline or metadata, which sometimes carries a timestamp.
• The document properties of a downloaded PDF or file.

If you find a reliable date, use it. Only when no publication or update date can be found anywhere should you use the no-date marker. Avoid guessing a date, since an invented date is worse than an honest no-date marker.

Keeping in-text and reference consistent

The single most important thing is that your in-text citation and your full reference use the same marker in the same place. If the in-text note shows the no-date marker, the reference entry must show it too. Building the citation with a generator and leaving the date field empty ensures both halves stay in agreement and use the exact abbreviation your style expects.

Estimated and approximate dates

Sometimes you cannot find an exact date but you have strong evidence of an approximate one, for example from surrounding content, a copyright range, or the context of the work. Several styles allow you to mark a date as approximate rather than dropping to the no-date marker entirely. An approximate date, clearly flagged as an estimate, is more informative than no date at all, because it still tells the reader roughly when the source belongs. The key is to signal clearly that the date is estimated, never to present a guess as if it were confirmed. Only when you have no basis for even an estimate should you use the plain no-date marker.

Why undated online sources need extra care

Undated web pages are the trickiest case because they can change silently. A page you cite today might be edited or deleted next month, and without a publication date the reader has no built-in reference point. That is exactly why the access date carries so much weight here: it pins your citation to a specific version you actually saw. For important undated sources, it is also worth saving a copy or an archived snapshot, so you can show what the page said at the time even if the live version later changes. The generator formats the citation; saving a record protects the evidence behind it.

A worked no-date example

Imagine you cite a company web page that explains a product but shows no published or updated date anywhere, and no usable copyright year. You would put the no-date marker where the year normally goes, both in your in-text citation and in the full reference. The reference would then carry the title, the website name, and the URL, with an access date near the link recording when you viewed the page. Your in-text citation pairs the author or title with the same no-date marker. Because both halves use the identical marker in the same spot, the short pointer and the full entry stay perfectly aligned.