diff --git a/.gitignore b/.gitignore
index 84575a9..2b0d7ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,8 @@
+.bloop/
+.metals/
+.vscode/
+
 target/
 out/
 project/project
+project/metals.sbt
diff --git a/src/main/scala/Puzzles.scala b/src/main/scala/Puzzles.scala
index 883c296..d9e1547 100644
--- a/src/main/scala/Puzzles.scala
+++ b/src/main/scala/Puzzles.scala
@@ -7,6 +7,7 @@ import akka.util.ByteString
 import chess.format.{ Fen, FullFen }
 import com.typesafe.config.ConfigFactory
 import java.nio.file.Paths
+import java.time.Instant
 import lila.db.dsl.*
 import reactivemongo.akkastream.cursorProducer
 import reactivemongo.api.*
@@ -27,7 +28,8 @@ object Puzzles:
       plays: Int,
       themes: List[String],
       openings: List[String],
-      gameUrl: String
+      gameUrl: String,
+      day: Option[Instant]
   )
 
   def main(args: Array[String]): Unit =
@@ -65,6 +67,7 @@ object Puzzles:
       plays      <- doc.int("plays")
       themes     <- doc.getAsOpt[List[String]]("themes")
       gameId     <- doc.string("gameId")
+      day      = doc.getAsOpt[Instant]("day")
       openings = doc.getAsOpt[List[String]]("opening")
     yield PuzzleLine(
       id = id,
@@ -80,7 +83,8 @@ object Puzzles:
         val hash    = Fen.readPly(fen).map(_ + 1).fold("")(p => s"#$p")
         s"https://lichess.org/${gameId}${if asWhite then "" else "/black"}$hash"
       ,
-      openings = openings.getOrElse(Nil)
+      openings = openings.getOrElse(Nil),
+      day = day
     )
 
     def toCsvLine(puzzle: PuzzleLine): String =
@@ -94,7 +98,8 @@ object Puzzles:
         puzzle.plays,
         puzzle.themes.sorted.mkString(" "),
         puzzle.gameUrl,
-        puzzle.openings.mkString(" ")
+        puzzle.openings.mkString(" "),
+        puzzle.day.map(_.toEpochMilli()).getOrElse("")
       ).mkString(",")
 
     def csvSink: Sink[String, Future[IOResult]] =
@@ -134,7 +139,9 @@ object Puzzles:
           .map(toCsvLine)
           .prepend(
             Source(
-              List("PuzzleId,FEN,Moves,Rating,RatingDeviation,Popularity,NbPlays,Themes,GameUrl,OpeningTags")
+              List(
+                "PuzzleId,FEN,Moves,Rating,RatingDeviation,Popularity,NbPlays,Themes,GameUrl,OpeningTags,DailyDate"
+              )
             )
           )
           .runWith(csvSink)
diff --git a/web/index.html.tpl b/web/index.html.tpl
index f2275f8..231c8f4 100644
--- a/web/index.html.tpl
+++ b/web/index.html.tpl
@@ -136,12 +136,12 @@
           </p>          
           <h3 id="puzzle_format">Format</h3>
           <p>Puzzles are formatted as standard CSV. The fields are as follows:</p>
-          <pre>PuzzleId,FEN,Moves,Rating,RatingDeviation,Popularity,NbPlays,Themes,GameUrl,OpeningTags</pre>
+          <pre>PuzzleId,FEN,Moves,Rating,RatingDeviation,Popularity,NbPlays,Themes,GameUrl,OpeningTags,DailyDate</pre>
           <h3 id="puzzle_sample">Sample</h3>
-          <pre>00sHx,q3k1nr/1pp1nQpp/3p4/1P2p3/4P3/B1PP1b2/B5PP/5K2 b k - 0 17,e8d7 a2e6 d7d8 f7f8,1760,80,83,72,mate mateIn2 middlegame short,https://lichess.org/yyznGmXs/black#34,Italian_Game Italian_Game_Classical_Variation
-00sJ9,r3r1k1/p4ppp/2p2n2/1p6/3P1qb1/2NQR3/PPB2PP1/R1B3K1 w - - 5 18,e3g3 e8e1 g1h2 e1c1 a1c1 f4h6 h2g1 h6c1,2671,105,87,325,advantage attraction fork middlegame sacrifice veryLong,https://lichess.org/gyFeQsOE#35,French_Defense French_Defense_Exchange_Variation
-00sJb,Q1b2r1k/p2np2p/5bp1/q7/5P2/4B3/PPP3PP/2KR1B1R w - - 1 17,d1d7 a5e1 d7d1 e1e3 c1b1 e3b6,2235,76,97,64,advantage fork long,https://lichess.org/kiuvTFoE#33,Sicilian_Defense Sicilian_Defense_Dragon_Variation
-00sO1,1k1r4/pp3pp1/2p1p3/4b3/P3n1P1/8/KPP2PN1/3rBR1R b - - 2 31,b8c7 e1a5 b7b6 f1d1,998,85,94,293,advantage discoveredAttack master middlegame short,https://lichess.org/vsfFkG0s/black#62,</pre>
+          <pre>00sHx,q3k1nr/1pp1nQpp/3p4/1P2p3/4P3/B1PP1b2/B5PP/5K2 b k - 0 17,e8d7 a2e6 d7d8 f7f8,1760,80,83,72,mate mateIn2 middlegame short,https://lichess.org/yyznGmXs/black#34,Italian_Game Italian_Game_Classical_Variation,
+00sJ9,r3r1k1/p4ppp/2p2n2/1p6/3P1qb1/2NQR3/PPB2PP1/R1B3K1 w - - 5 18,e3g3 e8e1 g1h2 e1c1 a1c1 f4h6 h2g1 h6c1,2671,105,87,325,advantage attraction fork middlegame sacrifice veryLong,https://lichess.org/gyFeQsOE#35,French_Defense French_Defense_Exchange_Variation,1607774862751
+00sJb,Q1b2r1k/p2np2p/5bp1/q7/5P2/4B3/PPP3PP/2KR1B1R w - - 1 17,d1d7 a5e1 d7d1 e1e3 c1b1 e3b6,2235,76,97,64,advantage fork long,https://lichess.org/kiuvTFoE#33,Sicilian_Defense Sicilian_Defense_Dragon_Variation,
+00sO1,1k1r4/pp3pp1/2p1p3/4b3/P3n1P1/8/KPP2PN1/3rBR1R b - - 2 31,b8c7 e1a5 b7b6 f1d1,998,85,94,293,advantage discoveredAttack master middlegame short,https://lichess.org/vsfFkG0s/black#62,,</pre>
           <h3 id="puzzle_notes">Notes</h3>
             <p>
               Moves are in UCI format. Use a chess library to convert them to SAN, for display.
@@ -167,6 +167,9 @@
               The <code>OpeningTags</code> field is only set for puzzles starting before move 20.
               Here's the <a href="https://github.com/lichess-org/chess-openings">list of possible openings</a>.
             </p>
+            <p> 
+              The <code>DailyDate</code> field is a Unix timestamp in milliseconds. If present, it indicates the date when the puzzle was featured as a daily puzzle on <a href="https://lichess.org/training/daily">lichess.org/training/daily</a>.
+            </p>
             <p>
               <a href="https://github.com/ornicar/lichess-puzzler/tree/master/generator">Generating these chess puzzles</a>
               took more than 100 years of CPU time.<br />