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Editorial Team
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Asked: 2026-05-25T02:40:34+00:00

Each user of our application can have different format for Date and Time. I

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Each user of our application can have different format for Date and Time. I understand the date format is dependent on user’s language and possibly time zone.

I guess I can try to run something like Date::DATE_FORMATS[:default] = "%m/%d/%Y" in ApplicationController. In this case Date.today.to_s would return the property formatted date. Will it be thread safe?

Another option I am looking at is to store profiles into config/locales/en.yml with different keys like en_US, en_GB, en_... and store locale name into the user’s profile. In this case I will need to use I18n.localize to format the date. Is it possible to fall back to en if there is no key found in specific en_US?

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  1. Editorial Team

    In the case of Date::DATE_FORMATS or TIME::DATE_FORMATS, you will need to take extra care to make their usage threadsafe, unfortunately. Shouldn’t be too difficult to do, however.

    AS for your second question, I believe you are concerned with locale fallbacks, and the i18n gem has support for locale fallbacks. This feature is easily enabled with:

    I18n::Backend::Simple.include(I18n::Backend::Fallbacks)
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