format a date in to the format month day, year hour:minute:second.fff am/pm zzz in ruby

You can use strftime method to format the date in your desired format. Here's an example:

main.rb
date = DateTime.now
formatted_date = date.strftime("%B %d, %Y %I:%M:%S.%L %p %Z")
puts formatted_date
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This will output something like January 01, 2022 12:00:00.000 AM EST, where:

• %B stands for full month name
• %d stands for day of the month with leading zeros (01-31)
• %Y stands for year with century
• %I stands for hour in 12-hour format with leading zeros (01-12)
• %M stands for minute with leading zeros (00-59)
• %S stands for second with leading zeros (00-59)
• %L stands for millisecond with leading zeros (000-999)
• %p stands for AM/PM designation
• %Z stands for timezone abbreviation

You can change the order of these elements and add other text as needed to make the date look exactly as you want.