diff --git a/cmd/prune.go b/cmd/prune.go
index bad04b4..7fa295e 100644
--- a/cmd/prune.go
+++ b/cmd/prune.go
@@ -150,5 +150,5 @@ func init() {
 	pruneCmd.Flags().StringVarP(&outtreefile, "output", "o", "stdout", "Output tree")
 	pruneCmd.Flags().StringVarP(&tipfile, "tipfile", "f", "none", "Tip file")
 	pruneCmd.Flags().BoolVarP(&revert, "revert", "r", false, "If true, then revert the behavior: will keep only species given in the command line, or keep only the species that are specific to the input tree, or keep only randomly selected taxa")
-	pruneCmd.PersistentFlags().IntVar(&randomtips, "random", 0, "Number of tips to randomly sample")
+	pruneCmd.Flags().IntVar(&randomtips, "random", 0, "Number of tips to randomly sample")
 }
diff --git a/cmd/prunedate.go b/cmd/prunedate.go
new file mode 100644
index 0000000..0863040
--- /dev/null
+++ b/cmd/prunedate.go
@@ -0,0 +1,67 @@
+package cmd
+
+import (
+	goio "io"
+	"os"
+
+	"github.com/evolbioinfo/gotree/io"
+	"github.com/evolbioinfo/gotree/tree"
+	"github.com/spf13/cobra"
+)
+
+var pruneMinDate float64
+
+// resolveCmd represents the resolve command
+var pruneDateCmd = &cobra.Command{
+	Use:   "date",
+	Short: "Cut the input tree by keeping only parts in date window",
+	Long: `Cut the input tree by keeping only parts in date window.
+
+This command will extract part of the tree corresponding to >= min-date and <= max-date.
+
+If min-date falls on an internal branch, it will create a new root node and will extract a tree starting at this node.
+If max-date falls on an internal branch, we do not take this part of the tree, and we remove branches that end into these cases.
+
+`,
+	RunE: func(cmd *cobra.Command, args []string) (err error) {
+		var f *os.File
+		var treefile goio.Closer
+		var treechan <-chan tree.Trees
+		var forest []*tree.Tree
+
+		if f, err = openWriteFile(outtreefile); err != nil {
+			io.LogError(err)
+			return
+		}
+		defer closeWriteFile(f, outtreefile)
+
+		if treefile, treechan, err = readTrees(intreefile); err != nil {
+			io.LogError(err)
+			return
+		}
+		defer treefile.Close()
+
+		for tr := range treechan {
+			if tr.Err != nil {
+				io.LogError(tr.Err)
+				return tr.Err
+			}
+			if forest, err = tr.Tree.CutTreeMinDate(pruneMinDate); err != nil {
+				io.LogError(err)
+				return
+			}
+			for _, t := range forest {
+				f.WriteString(t.Newick() + "\n")
+			}
+		}
+
+		return
+	},
+}
+
+func init() {
+	pruneCmd.AddCommand(pruneDateCmd)
+	pruneDateCmd.PersistentFlags().StringVarP(&intreefile, "input", "i", "stdin", "Input tree(s) file")
+	pruneDateCmd.PersistentFlags().StringVarP(&outtreefile, "output", "o", "stdout", "Forest output file")
+	pruneDateCmd.PersistentFlags().Float64Var(&pruneMinDate, "min-date", 0, "Minimum date to cut the tree")
+}
diff --git a/tree/dates.go b/tree/dates.go
index 2d864bc..4f33f54 100644
--- a/tree/dates.go
+++ b/tree/dates.go
@@ -2,7 +2,9 @@ package tree
 
 import (
 	"fmt"
+	"regexp"
 	"sort"
+	"strconv"
 
 	"github.com/evolbioinfo/gotree/io"
 )
@@ -13,6 +15,47 @@ type LTTData struct {
 	Y int     // Number of lineages
 }
 
+// Get Node dates
+// Returns a slice of float correspsponding to all node dates (internal and external)
+// Node IDs are their index in the slice.
+// If one node does not have date or a malformed date, returns an error
+func (t *Tree) NodeDates() (ndates []float64, err error) {
+	var date float64
+	var pattern *regexp.Regexp
+	var matches []string
+
+	ndates = make([]float64, 0)
+	pattern = regexp.MustCompile(`(?i)&date="(.+)"`)
+	nnodes := 0
+	t.PreOrder(func(cur *Node, prev *Node, e *Edge) (keep bool) {
+		keep = true
+		if cur.Id() != nnodes {
+			err = fmt.Errorf("node id does not correspond to postorder traversal: %d vs %d", cur.Id(), nnodes)
+			keep = false
+		} else if len(cur.Comments()) > 0 {
+			keep = false
+			for _, c := range cur.Comments() {
+				matches = pattern.FindStringSubmatch(c)
+				if len(matches) < 2 {
+					err = fmt.Errorf("no date found: %s", c)
+				} else if date, err = strconv.ParseFloat(matches[1], 64); err != nil {
+					err = fmt.Errorf("one of the node date is malformed: %s", c)
+				} else {
+					ndates = append(ndates, date)
+					err = nil
+					keep = true
+				}
+			}
+		} else {
+			err = fmt.Errorf("a node with no date found")
+			keep = false
+		}
+		nnodes += 1
+		return
+	})
+	return
+}
+
 // LTTData describes a Lineage to Time data point
 func (t *Tree) LTT() (lttdata []LTTData) {
 	var lttdatadup []LTTData
@@ -105,3 +148,76 @@ func (t *Tree) RTT() (rttdata []RTTData, err error) {
 
 	return
 }
+
+// CutTreeMinDate traverses the tree, and only keep subtree starting at the given min date
+//
+// If a node has the exact same date as mindate: it becomes the root of a new tree
+// If a node has a date > mindate and its parent has a date < mindate: a new node is added as a the root of a new tree, with one child, the currrent node.
+// The output is a forest
+func (t *Tree) CutTreeMinDate(mindate float64) (forest []*Tree, err error) {
+	var dates []float64
+	forest = make([]*Tree, 0, 10)
+	var tmpforest []*Tree
+
+	// If the field [&date=] exists, then takes it
+	// Otherwise, returns an error
+	if dates, err = t.NodeDates(); err != nil {
+		io.LogWarning(err)
+		err = fmt.Errorf("no dates provided in in the tree, of the form &date=")
+		io.LogWarning(err)
+		return
+	}
+
+	if tmpforest, err = cutTreeMinDateRecur(t.Root(), nil, nil, mindate, dates); err != nil {
+		return
+	}
+	forest = append(forest, tmpforest...)
+
+	return
+}
+
+func cutTreeMinDateRecur(cur, prev *Node, e *Edge, mindate float64, dates []float64) (forest []*Tree, err error) {
+	// We take the branches/nodes >= min-date
+	var tmptree *Tree
+	var tmpnode *Node
+	var tmpedge *Edge
+	var tmpforest []*Tree
+
+	forest = make([]*Tree, 0)
+	// The current node is at the exact min date: we keep the subtree starting at this node
+	// And disconnect the current node from its parent
+	if dates[cur.Id()] == mindate || (prev == nil && dates[cur.Id()] >= mindate) {
+		tmptree = NewTree()
+		tmptree.SetRoot(cur)
+		prev.delNeighbor(cur)
+		cur.delNeighbor(prev)
+		tmptree.ReinitIndexes()
+		forest = append(forest, tmptree)
+		return
+	} else if prev != nil && dates[cur.Id()] > mindate && dates[prev.Id()] < mindate {
+		tmptree = NewTree()
+		tmpnode = tmptree.NewNode()
+		tmptree.SetRoot(tmpnode)
+		prev.delNeighbor(cur)
+		cur.delNeighbor(prev)
+		tmpedge = tmptree.ConnectNodes(tmpnode, cur)
+		tmpnode.AddComment(fmt.Sprintf("&date=\"%f\"", mindate))
+		tmpedge.SetLength(e.Length() * (dates[cur.Id()] - mindate) / (dates[cur.Id()] - dates[prev.Id()]))
+		//tmptree.ReinitIndexes()
+		forest = append(forest, tmptree)
+		return
+	}
+
+	edges := make([]*Edge, len(cur.Edges()))
+	copy(edges, cur.Edges())
+	neigh := make([]*Node, len(cur.neigh))
+	copy(neigh, cur.neigh)
+	for i, n := range neigh {
+		if n != prev {
+			tmpforest, err = cutTreeMinDateRecur(n, cur, edges[i], mindate, dates)
+			forest = append(forest, tmpforest...)
+		}
+	}
+
+	return
+}
diff --git a/tree/node.go b/tree/node.go
index d25931c..cb87679 100644
--- a/tree/node.go
+++ b/tree/node.go
@@ -231,7 +231,7 @@ func (n *Node) RotateNeighbors() {
 // from the current node
 func (n *Node) Newick(parent *Node, newick *bytes.Buffer) {
 	if len(n.neigh) > 0 {
-		if len(n.neigh) > 1 {
+		if len(n.neigh) > 1 || parent == nil {
 			newick.WriteString("(")
 		}
 		nbchild := 0
@@ -268,7 +268,7 @@ func (n *Node) Newick(parent *Node, newick *bytes.Buffer) {
 				nbchild++
 			}
 		}
-		if len(n.neigh) > 1 {
+		if len(n.neigh) > 1 || parent == nil {
 			newick.WriteString(")")
 		}
 	}
diff --git a/tree/stats.go b/tree/stats.go
index 606387f..67f66ae 100644
--- a/tree/stats.go
+++ b/tree/stats.go
@@ -70,7 +70,11 @@ func (t *Tree) MeanSupport() float64 {
 func (t *Tree) MedianSupport() float64 {
 	edges := t.Edges()
 	tips := t.Tips()
-	supports := make([]float64, len(edges)-len(tips))
+	nsup := len(edges) - len(tips)
+	if nsup < 0 {
+		nsup = 0
+	}
+	supports := make([]float64, nsup)
 	if len(supports) == 0 {
 		return math.NaN()
 	}
diff --git a/tree/tree.go b/tree/tree.go
index cab2aa8..73a74ea 100644
--- a/tree/tree.go
+++ b/tree/tree.go
@@ -953,47 +953,6 @@ func (t *Tree) computeDepthUnRooted() {
 	}
 }
 
-// Get Node dates
-// Returns a slice of float correspsponding to all node dates (internal and external)
-// Node IDs are their index in the slice.
-// If one node does not have date or a malformed date, returns an error
-func (t *Tree) NodeDates() (ndates []float64, err error) {
-	var date float64
-	var pattern *regexp.Regexp
-	var matches []string
-
-	ndates = make([]float64, 0)
-	pattern = regexp.MustCompile(`(?i)&date="(.+)"`)
-	nnodes := 0
-	t.PreOrder(func(cur *Node, prev *Node, e *Edge) (keep bool) {
-		keep = true
-		if cur.Id() != nnodes {
-			err = fmt.Errorf("node id does not correspond to postorder traversal: %d vs %d", cur.Id(), nnodes)
-			keep = false
-		} else if len(cur.Comments()) > 0 {
-			keep = false
-			for _, c := range cur.Comments() {
-				matches = pattern.FindStringSubmatch(c)
-				if len(matches) < 2 {
-					err = fmt.Errorf("no date found: %s", c)
-				} else if date, err = strconv.ParseFloat(matches[1], 64); err != nil {
-					err = fmt.Errorf("one of the node date is malformed: %s", c)
-				} else {
-					ndates = append(ndates, date)
-					err = nil
-					keep = true
-				}
-			}
-		} else {
-			err = fmt.Errorf("a node with no date found")
-			keep = false
-		}
-		nnodes += 1
-		return
-	})
-	return
-}
-
 // Computes distance of all nodes to root / pseudo root.
 // Indices of the nodes in the rdists slice correspond to node ids
 func (t *Tree) NodeRootDistance() (rdists []float64) {