How do I Convert DateTime now to UTC in Ruby

Question

If I have d   DateTime now  how do I convert  d  into UTC  with the appropriate date

User · Answer

In irb    gt  gt d   DateTime now   gt    lt DateTime  11783702280454271 4800000000 5 12 2299161 gt   gt  gt     d hour to i - d zone to i    d min    d sec     gt   11 16 41    will convert the time to the utc  But as posted if it is just Time you can use   Time now utc   and get it straight away

User · Answer

The string representation of a DateTime can be parsed by the Time class    gt  Time parse DateTime now to s  utc   gt  2015-10-06 14 53 51 UTC

User · Answer

DateTime now new offset 0    will work in standard Ruby  i e  without ActiveSupport

User · Answer

d   DateTime now utc  Oops   That seems to work in Rails  but not vanilla Ruby  and of course that is what the question is asking   d   Time now utc   Does work however   Is there any reason you need to use DateTime and not Time  Time should include everything you need   irb main  016 0 gt  Time now   gt  Thu Apr 16 12 40 44  0100 2009

User · Answer

Unfortunately  the DateTime class doesn t have the convenience methods available in the Time class to do this  You can convert any DateTime object into UTC like this   d   DateTime now d new offset Rational 0  24     You can switch back from UTC to localtime using   d new offset DateTime now offset    where d is a DateTime object in UTC time  If you d like these as convenience methods  then you can create them like this   class DateTime   def localtime     new offset DateTime now offset    end    def utc     new offset Rational 0  24     end end   You can see this in action in the following irb session   d   DateTime now new offset Rational -4  24      gt    lt DateTime  106105391484260677 43200000000 -1 6 2299161 gt   1 8 7  185  gt  d to s    gt   2012-08-03T15 42 48-04 00   1 8 7  186  gt  d localtime to s    gt   2012-08-03T12 42 48-07 00   1 8 7  187  gt  d utc to s    gt   2012-08-03T19 42 48 00 00     As you can see above  the initial DateTime object has a -04 00 offset  Eastern Time   I m in Pacific Time with a -07 00 offset  Calling localtime as described previously properly converts the DateTime object into local time  Calling utc on the object properly converts it to a UTC offset

User · Answer

Try this  works in Ruby   DateTime now to time utc

User · Answer

You can set an ENV if you want your Time now and DateTime now to respond in UTC time   require  date  Time now    gt  2015-11-30 11 37 14 -0800 DateTime now to s    gt   2015-11-30T11 37 25-08 00  ENV  TZ      UTC  Time now    gt  2015-11-30 19 37 38  0000 DateTime now to s    gt   2015-11-30T19 37 36 00 00

[ruby] How do I Convert DateTime.now to UTC in Ruby?

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