Fix some Time & Date usages

app/models/iteration.rb

@@ -88,12 +88,12 @@ class Iteration < ApplicationRecord
   # ensure dates are in the future
   def future_date
     if start_date_changed?
-      errors.add(:start_date, s_("Iteration|cannot be in the past")) if start_date < Date.today
+      errors.add(:start_date, s_("Iteration|cannot be in the past")) if start_date < Date.current
       errors.add(:start_date, s_("Iteration|cannot be more than 500 years in the future")) if start_date > 500.years.from_now
     end
 
     if due_date_changed?
-      errors.add(:due_date, s_("Iteration|cannot be in the past")) if due_date < Date.today
+      errors.add(:due_date, s_("Iteration|cannot be in the past")) if due_date < Date.current
       errors.add(:due_date, s_("Iteration|cannot be more than 500 years in the future")) if due_date > 500.years.from_now
     end
   end

ee/app/services/ci/minutes/email_notification_service.rb

@@ -20,7 +20,7 @@ module Ci
       def notify_on_total_usage
         return unless namespace.shared_runners_minutes_used? && namespace.last_ci_minutes_notification_at.nil?
 
-        namespace.update_columns(last_ci_minutes_notification_at: Time.now)
+        namespace.update_columns(last_ci_minutes_notification_at: Time.current)
 
         CiMinutesUsageMailer.notify(namespace.name, recipients).deliver_later
       end

ee/spec/services/iterations/create_service_spec.rb

@@ -20,7 +20,7 @@ describe Iterations::CreateService do
           {
               title: 'v2.1.9',
               description: 'Patch release to fix security issue',
-              start_date: Time.now.to_s,
+              start_date: Time.current.to_s,
               due_date: 1.day.from_now.to_s
           }
         end