format a date in to the format 'yyyy-mm-dd hh:mm:ss' in ruby

You can format a date and time in Ruby using the strftime method. Here's an example of how to format a datetime object to the format you specified:

main.rb
require 'date'

# Create a datetime object
dt = DateTime.now

# Format the datetime object as a string
formatted_date = dt.strftime('%Y-%m-%d %H:%M:%S')

puts formatted_date
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This will output the current datetime as a string in the format 'yyyy-mm-dd hh:mm:ss'.

You can replace DateTime.now with any other datetime object you want to format, and you can modify the format string to change the output format. For more information on strftime format codes, see the Ruby documentation.