Last-Modified

The HTTP Last-Modified response header indicates the date and time that the resource was last modified.

Table of Contents

Usage

The Last-Modified response header is similar to the HTTP Date response header, except it indicates the date and time that the server believes the resource was last modified rather than generated. This HTTP header can be used as a condition, or validator in a conditional request. For example, HTTP requests that use the HTTP If-Modified-Since or If-Unmodified-Since headers will refer to the last modified date.

The directives are day-name, day, month, year, hour, minute, second, and GMT.

Note

For a complete description of the directives, please refer to the HTTP Date header.

Example

In this example, the resource was last modified on June 1st, 2022, at 8 am GMT.

Response

Last-modified: Wed, 01 Jun 2022 08:00:00 GMT

Takeaway

The Last-Modified response header indicates when the resource was last modified.

See also

Last updated: June 2, 2022