Magical 57.6 minutes in Time

ruby-talk
1

irb(main):80:0> RUBY_VERSION
=> "1.9.3"
irb(main):81:0> system("uname -a")
Linux krank 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:27:31 UTC
2012 i686 i686 i686 GNU/Linux
=> true
irb(main):82:0> require 'date'
=> false
irb(main):083:0> Time.new(2012, 11, 3, 12, 00) - Time.new(2012, 10, 3, 12, 00)
=> 2678400.0
irb(main):084:0> _ / 3600 / 24
=> 31.0
irb(main):085:0> Time.new(2012, 11, 4, 12, 00) - Time.new(2012, 10, 4, 12, 00)
=> 2682000.0
irb(main):086:0> _ / 3600 / 24
=> 31.041666666666668
irb(main):087:0> Time.new(2013, 1, 4, 12, 00) - Time.new(2012, 12, 4, 12, 00)
=> 2678400.0

2

If I understand your question (forgive me if not), have a think about what happened on November 4th this year. As a hint, I live in the UK and the answer is different on my machine...

···

On 19.11.2012 14:26, Todd Benson wrote:

irb(main):80:0> RUBY_VERSION
=> "1.9.3"
irb(main):81:0> system("uname -a")
Linux krank 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:27:31 UTC
2012 i686 i686 i686 GNU/Linux
=> true
irb(main):82:0> require 'date'
=> false
irb(main):083:0> Time.new(2012, 11, 3, 12, 00) - Time.new(2012, 10,
3, 12, 00)
=> 2678400.0
irb(main):084:0> _ / 3600 / 24
=> 31.0
irb(main):085:0> Time.new(2012, 11, 4, 12, 00) - Time.new(2012, 10,
4, 12, 00)
=> 2682000.0
irb(main):086:0> _ / 3600 / 24
=> 31.041666666666668
irb(main):087:0> Time.new(2013, 1, 4, 12, 00) - Time.new(2012, 12, 4, 12, 00)
=> 2678400.0

--
Alex Gutteridge

3

<facepalm>

Why not exactly 60 minutes, though?

···

On Mon, Nov 19, 2012 at 8:37 AM, Alex Gutteridge <alexg@ruggedtextile.com> wrote:

On 19.11.2012 14:26, Todd Benson wrote:

irb(main):80:0> RUBY_VERSION
=> "1.9.3"
irb(main):81:0> system("uname -a")
Linux krank 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:27:31 UTC
2012 i686 i686 i686 GNU/Linux
=> true
irb(main):82:0> require 'date'
=> false
irb(main):083:0> Time.new(2012, 11, 3, 12, 00) - Time.new(2012, 10,
3, 12, 00)
=> 2678400.0
irb(main):084:0> _ / 3600 / 24
=> 31.0
irb(main):085:0> Time.new(2012, 11, 4, 12, 00) - Time.new(2012, 10,
4, 12, 00)
=> 2682000.0
irb(main):086:0> _ / 3600 / 24
=> 31.041666666666668
irb(main):087:0> Time.new(2013, 1, 4, 12, 00) - Time.new(2012, 12, 4, 12,
00)
=> 2678400.0

If I understand your question (forgive me if not), have a think about what
happened on November 4th this year. As a hint, I live in the UK and the
answer is different on my machine...

--
Alex Gutteridge

4

irb(main):80:0> RUBY_VERSION
=> "1.9.3"
irb(main):81:0> system("uname -a")
Linux krank 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:27:31 UTC
2012 i686 i686 i686 GNU/Linux
=> true
irb(main):82:0> require 'date'
=> false
irb(main):083:0> Time.new(2012, 11, 3, 12, 00) - Time.new(2012, 10,
3, 12, 00)
=> 2678400.0
irb(main):084:0> _ / 3600 / 24
=> 31.0
irb(main):085:0> Time.new(2012, 11, 4, 12, 00) - Time.new(2012, 10,
4, 12, 00)
=> 2682000.0
irb(main):086:0> _ / 3600 / 24
=> 31.041666666666668
irb(main):087:0> Time.new(2013, 1, 4, 12, 00) - Time.new(2012, 12, 4, 12,
00)
=> 2678400.0

If I understand your question (forgive me if not), have a think about what
happened on November 4th this year. As a hint, I live in the UK and the
answer is different on my machine...

--
Alex Gutteridge

<facepalm>

Why not exactly 60 minutes, though?

Not sure where you get your 57.6mins from to be honest (a rounding error?). I get 745 hours in that span of seconds (744 hours is 31 days exactly):

2682000 / 60 / 60

[1] 745

(745-1)/24

[1] 31

···

On 19.11.2012 14:39, Todd Benson wrote:

On Mon, Nov 19, 2012 at 8:37 AM, Alex Gutteridge > <alexg@ruggedtextile.com> wrote:

On 19.11.2012 14:26, Todd Benson wrote:

--
Alex Gutteridge

5

Not sure where you get your 57.6mins from to be honest (a rounding error?).
I get 745 hours in that span of seconds (744 hours is 31 days exactly):

2682000 / 60 / 60

[1] 745

(745-1)/24

[1] 31

--
Alex Gutteridge

Yeah, I see what's going on. I'm dividing 745 by 24, which is giving
me the average number of days if there was no hour difference.

Thanks