![]() How to save datetimes for future events article by Lau Taarnskov. If you want to learn how to persist future datetimes: check out back_to_the_present # And Zonebie sets the time zone to a random one each time we run our tests Zonebie. time_travel_to ( "1 month ago" ) do end Delorean. use_zone ( "Sydney" ) do end # With Delorean, the syntax is a touch different Delorean. return # Alternatively we can use blocks, which only freeze the time inside our block Time. travel new_time # but will need to clean up after the spec, and return to current time Timecop. parse ( " 1:00:00" ) # With Timecop, we can freeze the time, Timecop. So that Rails will translate and compare the correct times. We should always use Time.current for any database queries, Rails saves timestamps to the database in UTC time zone. tomorrow => Mon, # Going through Rails' helpers, we get the correct tomorrow as well > 1. today => Sun, # And gives us the correct tomorrow according to our application's time zone > Time. today => Sat, # But going through `zone` again, and we are back to application time > Time. in_time_zone => Sun, 09 : 56 : 57 FJT + 12 : 00 # Let's do the same with Date (we are still in Fiji time, remember?) # This again is the date on my machine, system date > Date. current => Sun, 09 : 54 : 17 FJT + 12 : 00 # Or even translate the system time to application time with `in_time_zone` > Time. now => Sun, 09 : 53 : 42 FJT + 12 : 00 # We can also use `current` to get the same > Time. now => 2015 - 07 - 04 17 : 53 : 37 - 0400 # However, if we use `zone` first, we finally get the current time in Fiji > Time. zone = "Fiji" => "Fiji" # But we still get my system time > Time. # This is the time on my machine, also commonly described as "system time" > Time. ![]() In Rails, to see all the available time zones, run: Rails provides the same API as Ruby Time instances, so that Time andĪctiveSupport::TimeWithZone instances are interchangeable,Īnd you should never need to create a TimeWithZone instance “Eastern Time (US & Canada)” instead of “America/New_York”).Īnd together with ActiveSupport::TimeWithZone, Set of zones provided by TZInfo to a meaningful subset of 146 zones. Rails’ ActiveSupport::TimeZone is a wrapper around TZInfo that limits the It is available as a gem and includes data on 582 different time zones. TZInfo is another time zone library, which providesĭaylight-saving-aware transformations between times in different time zones. The rest of this article, Time will be used in all the examples. With Time covering concepts of leapseconds and daylight saving time. Since Ruby 1.9.3 there are fewer differences between the two libraries, Ruby provides two classes to manage time: Time and DateTime. The second article is about a case study in multiple time zones. This is the first article of a 2-part series.
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