diff --git a/test/tparser.nim b/test/tparser.nim
index defa14a..9e71079 100644
--- a/test/tparser.nim
+++ b/test/tparser.nim
@@ -73,9 +73,9 @@ macro genTests(): untyped =
   echo "[tparser] Generating tests from " & absolutePath
   discard staticExec("git submodule init && git submodule update --remote")
 
-  let errorTests = toSet(staticExec("cd " & (absolutePath / "tags" / "error") &
+  let errorTests = toHashSet(staticExec("cd " & (absolutePath / "tags" / "error") &
                          " && ls -1d *").splitLines())
-  let ignored = toSet(["3MYT", "JDH8", "2EBW", "9KAX", "AB8U", "B63P", "FBC9",
+  let ignored = toHashSet(["3MYT", "JDH8", "2EBW", "9KAX", "AB8U", "B63P", "FBC9",
                        "Q5MG", "S98Z", ".git", "name", "tags", "meta"])
 
   result = newStmtList()
diff --git a/yaml/serialization.nim b/yaml/serialization.nim
index 128f80a..8a3895c 100644
--- a/yaml/serialization.nim
+++ b/yaml/serialization.nim
@@ -404,7 +404,7 @@ proc constructObject*(s: var YamlStream, c: ConstructionContext,
 
 proc representObject*(value: Time, ts: TagStyle, c: SerializationContext,
                       tag: TagId) {.raises: [ValueError].} =
-  let tmp = value.getGMTime()
+  let tmp = value.utc()
   c.put(scalarEvent(tmp.format("yyyy-MM-dd'T'HH:mm:ss'Z'")))
 
 proc yamlTag*[I](T: typedesc[seq[I]]): TagId {.inline, raises: [].} =