This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

switch calendar fromat from 24 hr to 12 hr

  • 1 reply
  • 4 have this problem
  • 10 views
  • Last reply by Matt

more options

When I switched from windows 8.1 to windows 10 Thunderbird switched the time format from 12 hr to 24 hr. How do I switch back to the 12 hr format?

When I switched from windows 8.1 to windows 10 Thunderbird switched the time format from 12 hr to 24 hr. How do I switch back to the 12 hr format?

Chosen solution

If my understanding is correct Lightning uses your operating system default time format. So I assume you need to change windows 10s default to 12hour from 24 hour.

I tried locating information on the Microsoft site, but it was just not helpful. so see about half way down this page http://www.sysprobs.com/change-date-format-windows-7-ddmmyyyy

Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

If my understanding is correct Lightning uses your operating system default time format. So I assume you need to change windows 10s default to 12hour from 24 hour.

I tried locating information on the Microsoft site, but it was just not helpful. so see about half way down this page http://www.sysprobs.com/change-date-format-windows-7-ddmmyyyy