Use UTC time for request params

Author: nalabjp

lib/statistics/client.rb

@@ -121,10 +121,11 @@ def initialize
       def fetch_events(group_id:, since_at: nil, until_at: nil)
         params = {
           fields: %i(attending_count start_time owner),
-          limit: 100,
-          since: since_at,
-          until: until_at
-        }.compact
+          limit: 100
+        }.tap do |h|
+          h[:since] = (since_at.utc + since_at.utc_offset).to_i if since_at
+          h[:until] = (until_at.utc + until_at.utc_offset).to_i if until_at
+        end
 
         events = []