Time conversion between ruby on rails and javascript vice versa?

Question

How to convert ruby time to javascript time and vice versa?

Ruby on rails :

 Time.now

Javascript :

 new Date()


        

Answer 1

These methods in both are equivalent, use either:

For Ruby:

Time.now.httpdate

For Javascript:

new Date().toUTCString()

Output for both:

Tue, 04 Jul 2017 14:18:31 GMT

Answer 2

Use strftime to get miliseconds:

<script>
  date = new Date(<%= DateTime.now.strftime '%Q' %>);
</script>

And parse back to Ruby using to_date:

params[:date].to_date

to_date accepts few formats:

'3-2-2001'
'03/02/2001'
'2001-02-03'
'3rd Feb 2001'
'20010203'

Answer 3

From jquery to rails:

"Wed Mar 12 2014 23:45:39 GMT+0530 (IST)".to_time

Answer 4

I think it will help you :

ruby date to javascript date conversion:

<script>
  var date_str = <% Date.today %>;
  var date_obj = new Date(date_str);
</script>

javascript date to ruby date conversion:

use this code in ruby class.

fetch date from params attributes.

date_str = params[:js_date]
date_obj = Date.parse(date_str)

for more info you can refer:

 http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html
 http://www.w3schools.com/jsref/jsref_parse.asp

Answer 5

Perhaps the most reliable way is to use seconds since the epoch for ruby, and milliseconds for JavaScript.

In ruby:

t = Time.now
# => 2014-03-12 11:18:29 -0700
t.to_f * 1000 # convert to milliseconds since 1970-01-01 00:00:00 UTC.
# => 1394648309130.185

This value can be directly given to the JavaScript Date constructor:

var d = new Date(1394648309130.185)
d // Wed Mar 12 2014 11:18:29 GMT-0700 (Pacific Daylight Time)

d.getTime() // 1394648309130 (Fractions of a millisecond are dropped)

The output of d.getTime() divided by 1000 can be given to ruby's Time.at():

Time.at( 1394648309130 / 1000.0 )
# => 2014-03-12 11:18:29 -0700