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software development ruby engineering
December 9th, 2021 - Erhan Berber

Formatting Dates in Ruby

When converting Date and DateTime objects to strings for display using a function like strftime, here's a handy reference sheet for the options you can use to format output.

Here's an example implementation to display a date in the mm/dd/yyyy format.

> the_date.strftime('%m/%d/%Y')
=> 12/10/2021

Ruby Date and Time Format Options


Format Description Example
%b Shortened month name "Jan"
%B Full month name "January"
%m Numbered month of the year (01..12) "01"
%d Day of the month (01..31) "15"
%j Day of the year (001..366) "123"
%a Shortened weekday name "Mon"
%A Full weekday name "Monday"
%w The numeric day of the week (0..6) "1"
%U Numeric week number in the year (0..53) [starting with the first Sunday] "22"
%W Numeric week number in the year (0..53) [starting with the first Monday] "22"
%y Two-digit year (00..99) "99"
%Y Four-digit year "2022"
%H Hour of the day (military time) (00..23) "18"
%I Hour of the day (12-hour clock) (01..12) "08"
%M Minute of the hour (0..59) "15"
%S Second of the minute (0..59) "30"
%p AM or PM "PM"
%Z Time zone name "Central Time (US & Canada)"

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