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You can localise the formats that Confluence uses to display dates and times within the web interface. The settings use the syntax of Java's SimpleDateFormat class, as described in this document: Java SimpleDateFormat.
There are three time and date format settings:
h:mm aMMM dd, yyyy HH:mmMMM dd, yyyyTo change the time and date formats:
Choose the cog icon , then choose General Configuration under Confluence Administration.