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Certain WordPress tag functions are used to display or return date and time information; the_date() and the_time() are examples of this. Some of these functions accept a parameter called a format string that allows you to determine how the date is going to be displayed. The format string is a template in which various parts of the date are combined (using "format characters") to generate a date in the format specified.

For example, the format string:

l, F j, Y

creates a date that look like this:

Friday, September 24, 2004

Here is what each format character in the string above represents:

  • l = Full name for day of the week (lower-case L).
  • F = Full name for the month.
  • j = The day of the month.
  • Y = The year in 4 digits.
(Commas are read literally.)

WordPress is written in the programming language PHP. The date formatting functions in WordPress use PHP's built-in date formatting functions. Therefore, you can use the table of date format characters on the PHP website as a reference for building date format strings for use in WordPress.

PHP.net: Date and Time Formatting