diff --git a/core/src/main/scala/format/pgn/Pgn.scala b/core/src/main/scala/format/pgn/Pgn.scala
index f31314f2..d73f0316 100644
--- a/core/src/main/scala/format/pgn/Pgn.scala
+++ b/core/src/main/scala/format/pgn/Pgn.scala
@@ -3,6 +3,7 @@ package format.pgn
 
 import cats.syntax.all.*
 import monocle.syntax.all.*
+import scalalib.model.Seconds
 
 type PgnTree = Node[Move]
 
@@ -56,17 +57,17 @@ case class Move(
     glyphs: Glyphs = Glyphs.empty,
     opening: Option[String] = None,
     result: Option[String] = None,
-    secondsLeft: Option[Int] = None, // %clk clock in seconds for the move player, after the move
-    moveTime: Option[Int] = None,    // %emt estimated move time in seconds
+    timeLeft: Option[Seconds] = None, // %clk clock in seconds for the move player, after the move
+    moveTime: Option[Seconds] = None, // %emt estimated move time in seconds
     variationComments: List[Comment] = Nil
 ):
 
   private def clockString: Option[String] = List(
-    secondsLeft.map(seconds => "[%clk " + Move.formatPgnSeconds(seconds) + "]"),
+    timeLeft.map(seconds => "[%clk " + Move.formatPgnSeconds(seconds) + "]"),
     moveTime.map(seconds => "[%emt " + Move.formatPgnSeconds(seconds) + "]")
   ).flatten.some.filter(_.nonEmpty).map(_.mkString(" "))
 
-  def hasComment = comments.nonEmpty || secondsLeft.isDefined || moveTime.isDefined
+  def hasComment = comments.nonEmpty || timeLeft.isDefined || moveTime.isDefined
 
   private def nonEmpty = hasComment || opening.isDefined || result.isDefined
 
@@ -99,6 +100,6 @@ object Move:
   private def noDoubleLineBreak(txt: String) =
     noDoubleLineBreakRegex.replaceAllIn(txt, "\n")
 
-  def formatPgnSeconds(t: Int): String =
-    val d = java.time.Duration.ofSeconds(t)
+  def formatPgnSeconds(t: Seconds): String =
+    val d = java.time.Duration.ofSeconds(t.value)
     f"${d.toHours}:${d.toMinutesPart}%02d:${d.toSecondsPart}%02d"
diff --git a/test-kit/src/main/scala/chess/ChessTreeArbitraries.scala b/test-kit/src/main/scala/chess/ChessTreeArbitraries.scala
index a7584b17..a38f3c87 100644
--- a/test-kit/src/main/scala/chess/ChessTreeArbitraries.scala
+++ b/test-kit/src/main/scala/chess/ChessTreeArbitraries.scala
@@ -3,6 +3,7 @@ package chess
 import cats.syntax.all.*
 import chess.format.pgn.{ Comment, Glyphs, InitialComments, Move as PgnMove, Pgn, Tags }
 import org.scalacheck.Gen
+import scalalib.model.Seconds
 
 case class GameTree[A](init: Situation, ply: Ply, tree: Option[Node[A]])
 case class WithMove[A](move: Move, data: A)
@@ -88,7 +89,7 @@ object ChessTreeArbitraries:
           comments <- genComments(5)
           glyphs   <- Gen.someOf(Glyphs.all).map(xs => Glyphs.fromList(xs.toList))
           clock    <- Gen.posNum[Int]
-        yield WithMove(move, PgnMove(move.san, comments, glyphs, secondsLeft = clock.some))
+        yield WithMove(move, PgnMove(move.san, comments, glyphs, timeLeft = Seconds(clock).some))
 
   def genNode[A: Generator](value: A, variations: List[A] = Nil): Gen[Node[A]] =
     value.next.flatMap: nextSeeds =>
diff --git a/test-kit/src/test/scala/format/pgn/TimeFormatTest.scala b/test-kit/src/test/scala/format/pgn/TimeFormatTest.scala
index 6317b3a3..3b939284 100644
--- a/test-kit/src/test/scala/format/pgn/TimeFormatTest.scala
+++ b/test-kit/src/test/scala/format/pgn/TimeFormatTest.scala
@@ -2,15 +2,17 @@ package chess
 package format.pgn
 
 import scalalib.time.*
+import scalalib.model.Seconds
 
 class TimeFormatTest extends ChessTest:
 
   test("format seconds"):
-    assertEquals(Move.formatPgnSeconds(0), "0:00:00")
-    assertEquals(Move.formatPgnSeconds(9), "0:00:09")
-    assertEquals(Move.formatPgnSeconds(60), "0:01:00")
-    assertEquals(Move.formatPgnSeconds(79835), "22:10:35")
-    assertEquals(Move.formatPgnSeconds(979835), "272:10:35")
+    def f(s: Int) = Move.formatPgnSeconds(Seconds(s))
+    assertEquals(f(0), "0:00:00")
+    assertEquals(f(9), "0:00:09")
+    assertEquals(f(60), "0:01:00")
+    assertEquals(f(79835), "22:10:35")
+    assertEquals(f(979835), "272:10:35")
 
   test("format PGN tags"):
     assertEquals(Tag.UTCDate.format.format(millisToDateTime(1680424483730L)), "2023.04.02")