The following conversion specifiers are recognized in the format string (taken from the PHP documentation for the strftime function). More info in the Open Group Specification

• %a - abbreviated weekday name according to the current locale
• %A - full weekday name according to the current locale
• %b - abbreviated month name according to the current locale
• %B - full month name according to the current locale
• %c - preferred date and time representation for the current locale
• %d - day of the month as a decimal number (range 00 to 31)
• %H - hour as a decimal number using a 24-hour clock (range 00 to 23)
• %I - hour as a decimal number using a 12-hour clock (range 01 to 12)
• %j - day of the year as a decimal number (range 001 to 366)
• %m - month as a decimal number (range 1 to 12)
• %M - minute as a decimal number
• %p - either `am' or `pm' according to the given time value, or the corresponding strings for the current locale
• %S - second as a decimal number
• %U - week number of the current year as a decimal number, starting with the first Sunday as the first day of the first week
• %W - week number of the current year as a decimal number, starting with the first Monday as the first day of the first week
• %w - day of the week as a decimal, Sunday being 0
• %x - preferred date representation for the current locale without the time
• %X - preferred time representation for the current locale without the date
• %y - year as a decimal number without a century (range 00 to 99)
• %Y - year as a decimal number including the century
• %Z - time zone or name or abbreviation
• %% - a literal `%' character