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Re: How can I add minutes,seconds and hours to a DateTime object?

From: Mike Stok <mike@...>
Date: 2013-07-02 22:33:25 UTC
List: ruby-talk #408667
On 2013-07-02, at 3:41 PM, Love U Ruby <lists@ruby-forum.com> wrote:

> finally I came up with as below :
>=20
> require 'date'
>=20
> text_t =3D '2:12:03 PM ET'
> dt =3D DateTime.parse(text_t, '%I:%M %p %Z')
> # =3D> #<DateTime: 2013-07-03T14:12:03+00:00=20
> ((2456477j,51123s,0n),+0s,2299161j)>
> dt.to_s
> # =3D> "2013-07-03T14:12:03+00:00" # !> invalid offset is ignored
> dh =3D Date._strptime(dt.to_s,'%Y-%m-%dT%H:%M:%S%z')
> # =3D> {:year=3D>2013,
> #     :mon=3D>7,
> #     :mday=3D>3,
> #     :hour=3D>14,
> #     :min=3D>12,
> #     :sec=3D>3,
> #     :zone=3D>"+00:00",
> #     :offset=3D>0}
>=20
> dh[:hour] +=3D 30 # =3D> 44
> dh
> # =3D> {:year=3D>2013,
> #     :mon=3D>7,
> #     :mday=3D>3,
> #     :hour=3D>44,
> #     :min=3D>12,
> #     :sec=3D>3,
> #     :zone=3D>"+00:00",
> #     :offset=3D>0}
>=20
> dh.values[0..-2].join(" ")
> # =3D> "2013 7 3 44 12 3 +00:00"
> DateTime.ordinal(*dh.values[0..-3])
> # =3D> #<DateTime: 2013-01-07T03:44:12+00:00=20
> ((2456300j,13452s,0n),+0s,2299161j)>
>=20
> Please suggest me if any wrong calculation has been made by me? Please
>=20
> Thanks
>=20
> --=20
> Posted via http://www.ruby-forum.com/.

It does seem odd that 30 hours after 2013-07-03T14:12:03+00:00 is =
2013-01-07T03:44:12+00:00, and you do seem to be doing a lot of work to =
add 30 hours - looking a the code there is a lot of "noise".

If I look at the documentation for DateTime then I see I can use + to =
add a fractional number of days, =
http://www.ruby-doc.org/stdlib-2.0/libdoc/date/rdoc/Date.html#method-i-2B =
, so:

ratdog:tmp mike$ pry
[1] pry(main)> require 'date'
=3D> false
[2] pry(main)> dt =3D DateTime.parse('2:12:03 PM ET', '%I:%M %p %Z')
=3D> #<DateTime: 2013-07-02T14:12:03+00:00 =
((2456476j,51123s,0n),+0s,2299161j)>
[3] pry(main)> dt + (30.0 / 24) # days
=3D> #<DateTime: 2013-07-03T20:12:03+00:00 =
((2456477j,72723s,0n),+0s,2299161j)>

Hope this helps,

Mike

--=20

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.







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