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Last active June 11, 2025 14:47

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Ruby ISO8601 time in milliseconds

Raw

So you want to generate ISO8601 formatted timestamps in Ruby, but need resolution finer than a second?

First, make sure to require 'time' in order to get ISO8601 formatting. But that gets you this:

2.1.0 :001 > require 'time'
 => true 
2.1.0 :002 > Time.now.utc.iso8601
 => "2015-11-12T04:46:43Z"

The round() method will get you finer resolution!

2.1.0 :003 > Time.now.utc.round(10).iso8601(6)
=> "2015-11-12T04:47:55.196329Z"

🎉 Thanks!

thanks!

❤️ thanks!

Love this. Just to reiterate, you only need to specify the number of decimals in .iso8601. You don't need/want round.

Time.current.utc.iso8601( 3 )
#=> "2025-06-11T14:45:48.072Z"