Convert String to Datetime Ruby on Rails

Convert string to datetime ruby on rails

You can use DateTime to parse the date from a specific format.

if the format you are looking to parse is "03/28/2018 1:46 AM" then you can do this.

date = DateTime.strptime('03/28/2018 1:46 AM', '%m/%d/%Y %I:%M %p')

# date to ISO 8601

puts date.to_time
# output: 2018-03-28 07:16:00 +0530

puts date.strftime("%m/%d/%Y")
# output: 03/28/2018

Date formats:

Date (Year, Month, Day):

%Y - Year with century (can be negative, 4 digits at least)
        -0001, 0000, 1995, 2009, 14292, etc.
%m - Month of the year, zero-padded (01..12)
        %_m  blank-padded ( 1..12)
        %-m  no-padded (1..12)
%d - Day of the month, zero-padded (01..31)
        %-d  no-padded (1..31)

Time (Hour, Minute, Second, Subsecond):

%H - Hour of the day, 24-hour clock, zero-padded (00..23)
%k - Hour of the day, 24-hour clock, blank-padded ( 0..23)
%I - Hour of the day, 12-hour clock, zero-padded (01..12)
%l - Hour of the day, 12-hour clock, blank-padded ( 1..12)
%P - Meridian indicator, lowercase (``am'' or ``pm'')
%p - Meridian indicator, uppercase (``AM'' or ``PM'')

%M - Minute of the hour (00..59)

You can refer to all formats here.

Convert String to DateTime Ruby

require 'date'

▶ Date.parse "2015-11-01T10:00:00.00+08:00"
#⇒ #<Date: 2015-11-01 ((2457328j,0s,0n),+0s,2299161j)>

▶ DateTime.parse "2015-11-01T10:00:00.00+08:00"
#⇒ #<DateTime: 2015-11-01T10:00:00+08:00 ((2457328j,7200s,0n),+28800s,2299161j)>

or, even better:

▶ DateTime.iso8601 "2015-11-01T10:00:00.00+08:00"
#⇒ #<DateTime: 2015-11-01T10:00:00+08:00 ((2457328j,7200s,0n),+28800s,2299161j)>

convert String to DateTime

DateTime.strptime allows you to specify the format and convert a String to a DateTime.

Convert string to date time in Ruby

Here you go:

DateTime.strptime("03/30/2021 4:30 PM", "%m/%d/%Y %H:%M %p") # =>  Tue, 30 Mar 2021 16:30:00 +0000

And here is the strptime method, https://ruby-doc.org/stdlib/libdoc/date/rdoc/DateTime.html

Convert string to datetime in specific timezone

You can use the in_time_zone method. For example:

DateTime.current.in_time_zone("Alaska")
# => Fri, 23 May 2014 07:21:30 AKDT -08:00

So for your use case:

params[:notify_at].to_datetime.in_time_zone(user.time_zone)

Pro Tip: If using Rails v4+ you can actually do this directly on the string:

"2014-07-05 14:30:00".in_time_zone("Alaska")
# => Sat, 05 Jul 2014 14:30:00 AKDT -08:00

UPDATE

You can parse a string directly into a time zone (where the String should already be IN that time zone) like this:

Time.zone.parse("2014-07-05 14:30:00")
# => Sat, 05 Jul 2014 14:30:00 CEST +02:00

So for your use case do:

user.time_zone.parse(params[:notify_at])

convert string to specific datetime format?

require 'date'

date = DateTime.parse("2011-05-19 10:30:14")
formatted_date = date.strftime('%a %b %d %H:%M:%S %Z %Y')

See strftime() for more information about formatting dates.

Rails convert datetimepicker date string to datetime data type

Don't you actually want a date? not a datetime?

In any case you can use

Date.strptime("12/13/2012", "%m/%d/%Y")
=> #<Date: 2012-12-13 ((2456275j,0s,0n),+0s,2299161j)>

DateTime.strptime("12/13/2012", "%m/%d/%Y")
=> #<DateTime: 2012-12-13T00:00:00+00:00 ((2456275j,0s,0n),+0s,2299161j)>

DateTime not working to convert string to date in rails

The issue is you are asking for seconds in your strptime call, but your time doesn't have seconds. Try this instead:

a = "03/17/2019 8:30 AM"
DateTime.strptime(a, "%m/%d/%Y %I:%M %P")

Or add seconds to your time.

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