Convert 12 Hr Time to 24 Hr Format in Ruby

Convert 12 hr time to 24 hr format in Ruby

I would first parse the string with Time#strptime and then output it with Time#strftime. This ensures a strict check with your original format as well.

require 'time'
Time.strptime("10pm", "%I%P").strftime("%H:%M")
=> "22:00"

Converting a 12 hour time string with AM/PM to 24 hour time

Have you tried this?
time = "12:00 PM"

Time.strptime(time, "%I:%M %P").strftime("%H:%M")

Convert 12-hour time to 24-hour time with a regex

You can take advantage of the fact that String#gsub accepts a block. Something like this will do for you?

s = "Mon-Fri: AM7:00-PM8:00\nSat-Sun: AM8:00-PM11:00"

s2 = s.gsub('AM', '').gsub(/PM(\d+)/) do |match|
  (match.gsub('PM', '').to_i + 12).to_s
end

s2 # => "Mon-Fri: 7:00-20:00\nSat-Sun: 8:00-23:00"

Convert 24 integer to 12 hour with am/pm

[14, 0, 23].map { |hour| Time.parse("#{hour}:00").strftime("%l %P") }
=> [" 2 pm", "12 am", "11 pm"]

Change 24 hour clock to 12 hour for created_at

Look up strftime (for any language), and build the actual template yourself. Per Time::DATE_FORMATS, the offending template is '%B %d, %Y %H:%M', so change the end to %I:%M %p.

(You also might want to add a new format to DATE_FORMATS...)

Convert to/from DateTime and Time in Ruby

You'll need two slightly different conversions.

To convert from Time to DateTime you can amend the Time class as follows:

require 'date'
class Time
  def to_datetime
    # Convert seconds + microseconds into a fractional number of seconds
    seconds = sec + Rational(usec, 10**6)

    # Convert a UTC offset measured in minutes to one measured in a
    # fraction of a day.
    offset = Rational(utc_offset, 60 * 60 * 24)
    DateTime.new(year, month, day, hour, min, seconds, offset)
  end
end

Similar adjustments to Date will let you convert DateTime to Time .

class Date
  def to_gm_time
    to_time(new_offset, :gm)
  end

  def to_local_time
    to_time(new_offset(DateTime.now.offset-offset), :local)
  end

  private
  def to_time(dest, method)
    #Convert a fraction of a day to a number of microseconds
    usec = (dest.sec_fraction * 60 * 60 * 24 * (10**6)).to_i
    Time.send(method, dest.year, dest.month, dest.day, dest.hour, dest.min,
              dest.sec, usec)
  end
end

Note that you have to choose between local time and GM/UTC time.

Both the above code snippets are taken from O'Reilly's Ruby Cookbook. Their code reuse policy permits this.

Ruby on Rails convert date and time value properly formatted utc time

Thanks everyone! But, I could solve the problem on my own!

time = bid_end_time.hour.to_s + ":" + bid_end_time.min.to_s + ":" + bid_end_time.sec.to_s
date_time = bid_end_date.to_s + " " + time
bid_end_date_time = Time.zone.parse(date_time).utc

24 hours in minutes in ruby on rails

The most appropriate way to do this is probably:

24.hours / 1.minute

This way you keep the readability and clear intention of the 'ruby mindset'.

Of course, this will have a constant value so you should probably store it in an appropriately named constant (e.g. MINUTES_IN_A_DAY) rather than calculating it every time.

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