WordPress stores in the abbreviations of weekday names in
weekday_abbrev weekday variable. It is a single dimensional array, indexed by the weekday name and is set in [wordpress root folder]/wp-includes/locale.php. Just like weekday global variable,
weekday_abbrev stores localized values.
Plugin and theme developers can use
weekday_abbrev to get abbreviation of a specified weekday name.
Back to full list of global variables.
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