How to Check a PDF’s Creation and Modification Dates

Updated 10 November 2026 · Standard formula, shown below

Checking a PDF’s creation and modification dates can help you understand when its metadata says the file was made or last saved. You can inspect these properties in a PDF reader or use your computer’s file details, but the two sources may show different dates because they measure different things. You will need the PDF and a compatible reader or access to your computer’s file properties.

What You’ll Need

The PDF file saved locally, or access to it in a PDF reader that can display document properties.
A desktop PDF application or a web browser that can open PDFs. The names and locations of commands vary by app and operating system.
Optionally, the file’s folder if you also want to compare the PDF’s internal dates with the file-system dates.

Step-by-Step

Open the PDF. Open the file in a desktop PDF reader or browser. If it opens in a browser, you may need to download it first to inspect properties using a separate application. Avoid uploading a confidential document to an unfamiliar online metadata checker.
Find the document properties command. In many desktop readers, open the File menu and choose Properties or Document Properties. Some apps place document information under a menu called Document, Details, or an information icon. In a browser, look for a document-information command in the PDF viewer’s toolbar or menu; if it is not available, use a PDF reader.
Open the Description or General tab. Look for fields named Created, Creation Date, Modified, or Last Modified. These usually refer to dates stored in the PDF’s metadata. Some readers show the metadata in a standardized format or include a time-zone offset.
Record both values and their context. Note the creation and modification values exactly as displayed, including the time and any time-zone information. If the reader shows the authoring application or PDF producer, record that too; it can help explain how the file was generated, but it does not verify the dates.
Check the file-system dates separately if needed. Close or minimize the reader and locate the PDF in your file manager. On Windows, right-click the file and select Properties, then check the General tab for dates such as Created and Modified. On macOS, select the file in Finder and choose File > Get Info; check the date fields in the information window. Labels and available dates can differ by system.
Compare the two sets of dates carefully. The PDF’s internal metadata describes values recorded inside the document. Your operating system’s dates describe the file as stored or handled on that device. A copy, download, restore, or transfer can change file-system dates without changing the PDF’s internal metadata, or vice versa.
Check another reader if a field is missing. If the first application does not display creation or modification information, open the same local file in another reputable PDF reader and inspect its document properties. Confirm that you are viewing the intended file, not a browser preview or a different copy.
Interpret the result as metadata, not proof. PDF dates are values saved in the file and can be absent, inaccurate, or changed by software or a person. For a routine check, they are useful clues. If you need reliable evidence of when a document existed or who changed it, seek an authenticated record, such as a trusted digital signature or a controlled document-management history.

Common Mistakes

Confusing PDF dates with file dates. A file manager’s Created or Modified date is not necessarily the same as the PDF’s internal creation or modification date. Identify which source you are reading before drawing a conclusion.
Treating a creation date as the original document’s birth date. A PDF made by exporting an older document may show the export date, not when the original text or design was first written.
Assuming the dates cannot be edited. Metadata is not inherently tamper-proof. A displayed date alone cannot establish when a PDF was created or prove that it has remained unchanged.
Ignoring time zones and display formats. A timestamp may be shown in a different local time zone, or omit the zone altogether. Do not compare times as if they were in the same zone unless you know how the reader displays them.
Checking a different copy. Email attachments, cloud downloads, and renamed files may look alike but contain different metadata. Verify the file name and location before comparing results.

Tips

Keep the original file unchanged if you are documenting its properties. Opening a PDF usually does not alter it, but editing or resaving it can update metadata.
Record the application used, the displayed date and time, and the file location. This makes the result easier to reproduce and interpret later.
When comparing files, check more than the displayed dates. A checksum can help establish whether two files have identical contents, but it does not independently prove when either file was created.
If you only need a quick check, inspect the PDF’s document properties first. Use the operating system’s file details as a separate comparison, not as a substitute.

Troubleshooting

The properties window has no date fields: The PDF may not contain creation or modification metadata, or the application may not display it. Try another PDF reader. If the fields remain absent, report them as unavailable rather than guessing.

The date appears blank, zeroed, or implausible: The producing software may not have set a meaningful value, or a conversion process may have preserved old metadata. Check another copy or source file if available, but do not assume a suspicious-looking value identifies the true date.

The two dates differ: First check whether one date is internal PDF metadata and the other is a file-system date. Then consider whether the PDF was copied, downloaded, extracted from an archive, restored, or resaved. These events can affect one date source without updating the other.

The time is off by several hours: Look for a time-zone indicator in the PDF properties and account for the computer’s local time zone. Some readers convert stored timestamps for display; others may show a raw or incomplete value.

You cannot open document properties: Download the file to a location you can access, then open it in a desktop reader. If the file is password-protected or restricted, use only access you are authorized to use; do not try to bypass its protections.

You need dependable evidence: Metadata alone is weak evidence because it can be changed. Preserve the original and consult the source system’s audit history, a trusted digital signature, or an appropriate records custodian.

Frequently Asked Questions

Can I check a PDF’s dates without Adobe Acrobat?
Yes. Many PDF readers display document properties, and operating systems show file-system dates. The exact menus vary, and file-system dates are not the same as internal PDF dates.

Does the PDF creation date mean when the content was first written?
No. It commonly reflects when a PDF was generated or exported. The source document or its content may be older.

Can someone change a PDF’s creation or modification date?
Yes. PDF metadata can be altered by editing or file-processing software, so the dates should be treated as informational rather than tamper-proof evidence.

Why is the PDF modification date older than the file’s Modified date?
The file may have been copied, downloaded, or otherwise changed on your device without updating its internal PDF metadata. A reader may also display dates differently.

Can a browser show the PDF’s internal dates?
Some browser PDF viewers expose document information, but many do not. If you cannot find the properties command, download the PDF and open it in a PDF reader.

What if there is no creation date?
The metadata may never have been set or may have been removed. Check another copy or source record; if none is available, the original creation date cannot be determined from that PDF field.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.