diff --git a/Convert_Matlab/overlap.m b/Convert_Matlab/overlap.m
index 21508ba0a635f241618cf527bd13bb73cf393590..4de059cba28e0fbc79505067bb4fd25051709b53 100644
--- a/Convert_Matlab/overlap.m
+++ b/Convert_Matlab/overlap.m
@@ -24,8 +24,9 @@ toc
 
 clear
 disp('Processing Parameters_Anticyclonic_Eddies...')
-load('Parameters_Anticyclonic_Eddies.mat', 'Nanti')
+load('Parameters_Anticyclonic_Eddies.mat', 'Nanti', 'date_num')
 save('Nanti', 'Nanti', '-v6')
+save('date_num', 'date_num', '-v6')
 
 clear
 disp('Processing Parameters_Cyclonic_Eddies...')
diff --git a/Convert_Matlab/overlap_v6.py b/Convert_Matlab/overlap_v6.py
index 56769e4251caf03957b1fbccdb198c11cd67ec25..737ee0fab28a0f2f76951603644f2bac253913c7 100755
--- a/Convert_Matlab/overlap_v6.py
+++ b/Convert_Matlab/overlap_v6.py
@@ -10,11 +10,17 @@ import scipy.io as sio
 import csv
 import sys
 
+def adjust_n(n_Matlab):
+    k_Matlab = (n_Matlab - 1) // e_overestim
+    k = date_num[k_Matlab] - date_num[0]
+    return n_Matlab + (k - k_Matlab) * e_overestim
+
 orientation = sys.argv[1] # "cyclo" or "anti"
 id_child = sio.loadmat(f"id_child_{orientation}.mat", squeeze_me=True)\
     ["id_child"]
 n_eddies = sio.loadmat(f"N{orientation}.mat", squeeze_me = True)\
     [f"N{orientation}"].astype(int, casting = "safe", copy = False)
+date_num = sio.loadmat("date_num.mat", squeeze_me = True)["date_num"]
 n_dates = n_eddies.size
 print("n_dates =", n_dates)
 e_overestim = id_child.shape[0]
@@ -23,17 +29,19 @@ print("e_overestim =", e_overestim)
 with open(f"edgelist_{orientation}.csv", "w", newline = '') as edgelist:
     writer = csv.writer(edgelist, delimiter = ' ', lineterminator = "\n")
 
-    for k1 in range(n_dates):
-        for i1, id_child_1 in enumerate(id_child[:n_eddies[k1], k1]):
-            n1 = k1 * e_overestim + i1 + 1
+    for j1 in range(n_dates):
+        for i1, id_child_1 in enumerate(id_child[:n_eddies[j1], j1]):
+            n1 = (date_num[j1] - date_num[0]) * e_overestim + i1 + 1
             # id_child_1 may be an int, which means there is a single
             # successor, or id_child_1 may be a numpy array, which means
             # there are several successors.
 
             try:
                 # Try processing id_child_1 as an array:
-                for n2 in id_child_1:
+                for n_Matlab in id_child_1:
+                    n2 = adjust_n(n_Matlab)
                     writer.writerow((n1, n2))
             except TypeError:
                 # id_child_1 is a scalar int.
-                writer.writerow((n1, id_child_1))
+                n2 = adjust_n(id_child_1)
+                writer.writerow((n1, n2))
diff --git a/Convert_Matlab/tests.json b/Convert_Matlab/tests.json
index 02c990015b31cd10c590c4ebef9f8d6e89eb1be6..3b9e2fa343a5165e125a48139d66b4d49af18587 100644
--- a/Convert_Matlab/tests.json
+++ b/Convert_Matlab/tests.json
@@ -5,7 +5,8 @@
 	"required":
 	[
 	    "$src_dir/Convert_Matlab/Eurec4A_OA/id_child_cyclo.mat",
-	    "$src_dir/Convert_Matlab/Eurec4A_OA/Ncyclo.mat"
+	    "$src_dir/Convert_Matlab/Eurec4A_OA/Ncyclo.mat",
+	    "$src_dir/Convert_Matlab/Eurec4A_OA/date_num.mat"
 	]
     },
     {
@@ -14,7 +15,8 @@
 	"required":
 	[
 	    "$src_dir/Convert_Matlab/Eurec4A_OA/id_child_anti.mat",
-	    "$src_dir/Convert_Matlab/Eurec4A_OA/Nanti.mat"
+	    "$src_dir/Convert_Matlab/Eurec4A_OA/Nanti.mat",
+	    "$src_dir/Convert_Matlab/Eurec4A_OA/date_num.mat"
 	]
     },
     {