How to Convert Timestamp with Ruby

How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?

DateTime.strptime can handle seconds since epoch. The number must be converted to a string:

require 'date'
DateTime.strptime("1318996912",'%s')

How to convert timestamp with ruby

From the string you can parse it to DateTime passing the format, and then format the output string:

date_time = '10/18/2107 14:08:09'

puts DateTime.strptime(date_time, '%m/%d/%Y %H:%M:%S')
             .strftime('%Y M%m %d, %a %H:%M:%S %Z')

Note it's Tuesday and the time zone it's specified as 00:00.

Ruby - Convert formatted date to timestamp

Your date string is in RFC3339 format. You can parse it into a DateTime object, then convert it to Time and finally to a UNIX timestamp.

require 'date'

DateTime.rfc3339('2015-05-27T07:39:59Z')
#=> #<DateTime: 2015-05-27T07:39:59+00:00 ((2457170j,27599s,0n),+0s,2299161j)>

DateTime.rfc3339('2015-05-27T07:39:59Z').to_time
#=> 2015-05-27 09:39:59 +0200

DateTime.rfc3339('2015-05-27T07:39:59Z').to_time.to_i
#=> 1432712399

For a more general approach, you can use DateTime.parse instead of DateTime.rfc3339, but it is better to use the more specific method if you know the format, because it prevents errors due to ambiguities in the date string. If you have a custom format, you can use DateTime.strptime to parse it

Convert from timestamp to time

Ruby's Time.at expects seconds (with fraction). Per the definition

Creates a new Time object with the value given by time, the given number of seconds_with_frac, or seconds and microseconds_with_frac since the Epoch.

The value you provided is milliseconds. Change it to

Time.at(1500999892331/1000)
=> 2017-07-25 21:54:52 +0530
t.to_date
=> Tue, 25 Jul 2017

Convert timestamp string without timezone to Time object in known timezone

I ended up making use of a gem called "Time of Day", it will take a string and give you a time of day object, you can then convert that to local time in your current Time.zone on any date you chose:

Time.zone = "Europe/London"

time_string = "23/06/2021 13:46"
parts = time_string.split(" ")

date = Date.parse(parts[0])
tod = Tod::TimeOfDay.parse(parts[1])

tod.on date   # => Wed, 23 Jun 2021 13:46:00 BST +01:00

How to convert BSON::Timestamp to ruby time and vice versa

You can convert a BSON::Timestamp to a BSON::ByteBuffer using the #to_bson method.

You can then convert the BSON::ByteBuffer to an integer (#get_int64) that represents the number of milliseconds since the epoch.

Then use Time::at to convert that integer to a Time object

date_time = DateTime.new(2021,8,30)
date_time.to_time
#=> 2021-08-30 00:00:00 +0000
date_time.to_time.to_i
#=> 1630281600 
timestamp = BSON::Timestamp.from_bson(date_time.to_bson)
#=> #<BSON::Timestamp:0x00007fffe31da4a8 @seconds=379, @increment=2488994816>
timestamp.to_bson.get_int64 / 1000 
#=> 1630281600
Time.at(timestamp.to_bson.get_int64 / 1000).utc
#=> 2021-08-30 00:00:00 UTC

how to convert this (month/day/year ) date format to actual timestamp in rails

I think you just need format that string to valid format to convert to date, something like this:

old_format = '6/21/2021'.split('/')
old_format[0], old_format[1] = old_format[1], old_format[0]
old_format.join('/').to_date

How to convert timestamp?

Perhaps it is called ISO 8601. You can accept this form and turn it into a time object by doing this:

require "time"
Time.iso8601("2013-01-24T23:42:59Z")
# => 2013-01-24 23:42:59 UTC

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