strftime (ActiveSupport::TimeWithZone)

@fogonwater <cough>

%a - The abbreviated weekday name (“Sun”) %A - The full weekday name (“Sunday”) %b - The abbreviated month name (“Jan”) %B - The full month name (“January”) %c - The preferred local date and time representation %d - Day of the month (01..31) %H - Hour of the day, 24-hour clock (00..23) %I - Hour of the day, 12-hour clock (01..12) %j - Day of the year (001..366) %m - Month of the year (01..12) %M - Minute of the hour (00..59) %p - Meridian indicator (“AM” or “PM”) %S - Second of the minute (00..60) %U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53) %W - Week number of the current year, starting with the first Monday as the firstday of the first week (00..53) %w - Day of the week (Sunday is 0, 0..6) %x - Preferred representation for the date alone, no time %X - Preferred representation for the time alone, no date ...

Full article: http://apidock.com/rails/ActiveSupport/TimeWithZone/strftime