Render the time bounds with getutc so the caller's Time is left alone

lib/fbe/github_graph.rb

@@ -341,7 +341,7 @@ def pull_requests_with_reviews(owner, name, since, cursor: nil)
                 id
                 number
                 updatedAt
-                timelineItems(first: 1, itemTypes: [PULL_REQUEST_REVIEW], since: "#{since.utc.iso8601}") {
+                timelineItems(first: 1, itemTypes: [PULL_REQUEST_REVIEW], since: "#{since.getutc.iso8601}") {
                   nodes {
                     ... on PullRequestReview { id }
                   }
@@ -463,7 +463,7 @@ def total_commits_pushed(owner, name, since, till = Time.now)
               defaultBranchRef {
                 target {
                   ... on Commit {
-                    history(#{after}first: 100, since: "#{since.utc.iso8601}", until: "#{till.utc.iso8601}") {
+                    history(#{after}first: 100, since: "#{since.getutc.iso8601}", until: "#{till.getutc.iso8601}") {
                       totalCount
                       nodes {
                         oid
@@ -507,7 +507,7 @@ def total_commits_pushed(owner, name, since, till = Time.now)
   # @param [Time] till The datetime to
   # @return [Hash] A hash with total issues and pulls
   def total_issues_created(owner, name, since, till = Time.now)
-    window = "created:#{since.utc.iso8601}..#{till.utc.iso8601}"
+    window = "created:#{since.getutc.iso8601}..#{till.getutc.iso8601}"
     result = query(
       <<~GRAPHQL
         {

test/fbe/test_github_graph.rb

@@ -1058,4 +1058,50 @@ def test_fake_total_releases_published_dont_count_after_till
     h = graph.total_releases_published(owner, name, since, till: since + 60)
     assert_equal(1, h['releases'], "the fake counts releases published after the till moment, seed: #{seed}")
   end
+
+  def test_total_issues_created_keeps_the_given_since
+    seed = Random.new_seed
+    t = Time.new(2025, 1, 1, 10, 0, 0, format('+%02d:00', Random.new(seed).rand(1..12)))
+    g = Fbe::Graph.new(token: 'fake')
+    g.stub(:query, ->(_q) { {} }) { g.total_issues_created('o', 'n', t, t + 3600) }
+    refute_predicate(t, :utc?, "since is converted to UTC in place, seed #{seed}")
+  end
+
+  def test_total_issues_created_accepts_frozen_since
+    t = Time.new(2025, 1, 1, 10, 0, 0, '+03:00').freeze
+    g = Fbe::Graph.new(token: 'fake')
+    h = g.stub(:query, ->(_q) { {} }) { g.total_issues_created('o', 'n', t, t + 3600) }
+    assert_equal(0, h['issues'], 'frozen since is refused')
+  end
+
+  def test_total_issues_created_renders_the_window_in_utc
+    t = Time.new(2025, 1, 1, 10, 0, 0, '+03:00')
+    g = Fbe::Graph.new(token: 'fake')
+    seen = nil
+    g.stub(:query, ->(q) { seen = q and {} }) { g.total_issues_created('o', 'n', t, t + 3600) }
+    assert_includes(seen, 'created:2025-01-01T07:00:00Z..2025-01-01T08:00:00Z', 'window is not rendered in UTC')
+  end
+
+  def test_total_commits_pushed_keeps_the_given_till
+    seed = Random.new_seed
+    t = Time.new(2025, 1, 1, 10, 0, 0, format('-%02d:00', Random.new(seed).rand(1..11)))
+    g = Fbe::Graph.new(token: 'fake')
+    g.stub(:query, ->(_q) { { 'repository' => {} } }) { g.total_commits_pushed('o', 'n', t - 3600, t) }
+    refute_predicate(t, :utc?, "till is converted to UTC in place, seed #{seed}")
+  end
+
+  def test_total_commits_pushed_accepts_frozen_since
+    t = Time.new(2025, 1, 1, 10, 0, 0, '+03:00').freeze
+    g = Fbe::Graph.new(token: 'fake')
+    h = g.stub(:query, ->(_q) { { 'repository' => {} } }) { g.total_commits_pushed('o', 'n', t, t + 3600) }
+    assert_equal(0, h['commits'], 'frozen since is refused')
+  end
+
+  def test_pull_requests_with_reviews_accepts_frozen_since
+    t = Time.new(2025, 1, 1, 10, 0, 0, '+03:00').freeze
+    g = Fbe::Graph.new(token: 'fake')
+    answer = { 'repository' => { 'pullRequests' => { 'nodes' => [], 'pageInfo' => { 'hasNextPage' => false } } } }
+    h = g.stub(:query, ->(_q) { answer }) { g.pull_requests_with_reviews('o', 'n', t) }
+    assert_empty(h['pulls_with_reviews'], 'frozen since is refused')
+  end
 end