Add option to use UTC instead of local time.

README.md

@@ -95,6 +95,9 @@ Sidetiq.configure do |config|
 
   # Clock locking key expiration in ms (default: 1000).
   config.lock_expire = 100
+
+  # When `true` uses UTC instead of local times (default: false)
+  config.utc = false
 end
 ```
 

ext/sidetiq_ext/sidetiq_ext.c

@@ -92,6 +92,6 @@ void Init_sidetiq_ext()
         msidetiq = rb_define_module("Sidetiq");
         esidetiq_error = rb_define_class_under(msidetiq, "Error", rb_eStandardError);
         csidetiq_clock = rb_define_class_under(msidetiq, "Clock", rb_cObject);
-        rb_define_method(csidetiq_clock, "gettime", sidetiq_gettime, 0);
+        rb_define_private_method(csidetiq_clock, "clock_gettime", sidetiq_gettime, 0);
 }
 

lib/sidetiq/clock.rb

@@ -3,13 +3,14 @@ module Sidetiq
     config.priority = Thread.main.priority
     config.resolution = 1
     config.lock_expire = 1000
+    config.utc = false
   end
 
   class Clock
     include Singleton
     include MonitorMixin
 
-    START_TIME = Time.local(2010, 1, 1)
+    START_TIME = Sidetiq.config.utc ? Time.utc(2010, 1, 1) : Time.local(2010, 1, 1)
 
     attr_reader :schedules
 
@@ -34,6 +35,10 @@ module Sidetiq
       end
     end
 
+    def gettime
+      Sidetiq.config.utc ? clock_gettime.utc : clock_gettime
+    end
+
     private
 
     def enqueue(worker, time)

lib/sidetiq/views/sidetiq.slim

@@ -15,7 +15,7 @@ header.row
           = worker.name
         td= worker.get_sidekiq_options['queue']
         td
-          == relative_time(schedule.next_occurrence)
+          == relative_time(schedule.next_occurrence(@time))
         td
           a href="#{root_path}sidetiq/#{worker.name}" Details
 - else

lib/sidetiq/views/sidetiq_details.slim

@@ -30,7 +30,7 @@ table class="table table-striped table-bordered table-white" style="width: 100%;
   thead
     th style="width: 25%" Next 10 runs
     th style="width: 75%"
-  - @schedule.next_occurrences(10).each do |time|
+  - @schedule.next_occurrences(10, @time).each do |time|
     tr
       td
         time= time.getutc

lib/sidetiq/web.rb

@@ -13,14 +13,19 @@ module Sidetiq
       end
 
       app.get "/sidetiq" do
-        @schedules = Sidetiq::Clock.instance.schedules
+        clock = Sidetiq::Clock.instance
+        @schedules = clock.schedules
+        @time = clock.gettime
         slim :sidetiq
       end
 
       app.get "/sidetiq/:name" do
         halt 404 unless (name = params[:name])
 
-        schedules = Sidetiq::Clock.instance.schedules
+        clock = Sidetiq::Clock.instance
+        schedules = clock.schedules
+
+        @time = clock.gettime
 
         @worker, @schedule = schedules.select do |worker, schedule|
           worker.name == name

test/test_clock.rb

@@ -13,6 +13,13 @@ class TestClock < Sidetiq::TestCase
     refute_nil clock.gettime.tv_nsec
   end
 
+  def test_gettime_utc
+    refute clock.gettime.utc?
+    Sidetiq.config.utc = true
+    assert clock.gettime.utc?
+    Sidetiq.config.utc = false
+  end
+
   class FakeWorker; end
 
   def test_enqueues_jobs_by_schedule