Home/ Questions/Q 6578775
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-25T15:48:50+00:00

When doing startTime = DateTime.now startTime = startTime.change(:min => (startTime.min / 5.to_f).ceil * 5)

  • 0

When doing

startTime = DateTime.now
startTime = startTime.change(:min => (startTime.min / 5.to_f).ceil * 5)

our production server occasionally produces the following exception

A ArgumentError occurred in controller#action:

invalid date
/opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/1.8/date.rb:1519:in `civil'
vendor/bundle/ruby/1.8/gems/activesupport-3.0.9/lib/active_support/core_ext/date_time/calculations.rb:37:in `change'

And I just can’t figure out what causes the problem nor reproduce it in my development environment. Am I doing something wrong, or what is happening here? What I want to do is create a DateTime instance which is rounded up to the closest 5 min from now.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    If DateTime.now.min > 55, then you are setting the min value to 60.

    If you only need the time part:

    startTime = DateTime.now
new_minute = startTime.min / 5.to_f).ceil * 5
new_hour = DateTime.now.hour

if new_minute == 60
  new_minute = 0
  new_hour = new_hour + 1
end

new_time = startTime.change(:min => new_minute, :hour => new_hour)

    if you need more than this, I’d suggest using activesupport. Then you could do 

    new_time = startTime + (new_minute - min).minutes
    • 0