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Ruby Cheat Sheet – Date and time format

Posted in Rails

%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)
%e – Day of the month without leading zeroes (1..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)
%k – Hour of the day, 24-hour clock w/o leading zeroes ( 0..23)
%l – Hour of the day, 12-hour clock w/o leading zeroes ( 1..12)
%m – Month of the year (01..12)
%M – Minute of the hour (00..59)
%p – Meridian indicator (« AM » or « PM »)
%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 first
day 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
%y – Year without a century (00..99)
%Y – Year with century
%Z – Time zone name
%% – Literal « % » character

t = Time.now
t.strftime(« Printed on %m/%d/%Y ») #=> « Printed on 04/09/2003 »
t.strftime(« at %I:%M%p ») #=> « at 08:56AM »
t.strftime(« %e %B, %Y ») #=> « 9 April, 2003 »
t.strftime(« %Y-%m-%dT%H:%M:%S ») #=> « 2003-04-09T08:56:07 » (EN 28601)

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