diff --git a/DESCRIPTION b/DESCRIPTION
index 6f711e4db53f57e154f86e523b1c5f238d9b1315..3e30e2d92d551a7a254ef3b81cd5115ac000522d 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.6.8.15
+Version: 1.6.8.16
 Date: 2020-11-30
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl"), comment = c(ORCID = "0000-0002-1503-6204")),
diff --git a/R/SeriesAggreg.list.R b/R/SeriesAggreg.list.R
index 4378918e39867d36fb3200e6197e1adde78f1ef7..df517535a2aa2232cf0e8984e0ecd25fe4bb4d0c 100644
--- a/R/SeriesAggreg.list.R
+++ b/R/SeriesAggreg.list.R
@@ -3,7 +3,6 @@ SeriesAggreg.list <- function(TabSeries,
                               ConvertFun,
                               NewTimeFormat = NULL,
                               simplify = FALSE,
-                              DatesR = NULL,
                               except = NULL,
                               recursive = TRUE,
                               ...) {
@@ -18,54 +17,24 @@ SeriesAggreg.list <- function(TabSeries,
             call. = FALSE)
   }
   
-  # Determination of DateR
-  # 'DatesR' is explicitly provided by argument 'DatesR'
-  bDatesR <- !is.null(DatesR)
-  if (bDatesR) {
-    if (inherits(DatesR, "character")) {
-      DatesR <- DatesR[1]
-      if (!is.null(TabSeries[[DatesR]])) {
-        DatesR <- TabSeries[[DatesR]]
-      } else {
-        stop(
-          "The item selected by the argument 'DatesR'='",
-          DatesR,
-          "' should exist in 'TabSeries'"
-        )
-      }
-    } else {
-      if (!inherits(DatesR, "POSIXt")) {
-        stop("Argument 'DatesR' should be of class 'POSIXt' or 'character'")
-      }
-    }
-  }
-  
-  # If available, we take 'DatesR' item in 'TabSeries'
-  if (is.null(DatesR)) {
-    if (!is.null(TabSeries$DatesR)) {
-      DatesR <- TabSeries$DatesR
-    }
-  }
-  
-  # Auto-detection of POSIXt item in Tabseries
-  if (!is.null(DatesR)) {
-    if (!inherits(DatesR, "POSIXt")) {
-      stop("'DatesR' should be of class 'POSIXt'")
+  # Determination of DatesR
+  if (!is.null(TabSeries$DatesR)) {
+    if (!inherits(TabSeries$DatesR, "POSIXt")) {
+      stop("'TabSeries$DatesR' should be of class 'POSIXt'")
     }
+    DatesR <- TabSeries$DatesR
   } else {
+    # Auto-detection of POSIXt item in Tabseries
     itemPOSIXt <-
       which(sapply(TabSeries, function(x) {
         inherits(x, "POSIXt")
       }, simplify = TRUE))[1]
     if (is.na(itemPOSIXt)) {
       stop(
-        "One item of argument 'TabSeries' should be of class 'POSIXt' ",
-        "or the dates should be provided by the 'DatesR' argument"
-      )
+        "At least one item of argument 'TabSeries' should be of class 'POSIXt'")
     }
     warning(
-      "Item 'DatesR' not found in 'TabSeries' argument and no argument 'DatesR' ",
-      "provided. The item ",
+      "Item 'DatesR' not found in 'TabSeries' argument: the item ",
       names(TabSeries)[itemPOSIXt],
       " has been automatically chosen"
     )
@@ -139,10 +108,10 @@ SeriesAggreg.list <- function(TabSeries,
         listRes <-
           lapply(names(listCols),
                  function(x) {
+                   listCols[[x]]$DatesR <- DatesR
                    SeriesAggreg(
                      listCols[[x]],
                      Format = Format,
-                     DatesR = DatesR,
                      except = except,
                      ConvertFun = ConvertFun[x],
                      recursive = NULL,
diff --git a/man/SeriesAggreg.Rd b/man/SeriesAggreg.Rd
index 0a3375db3ef134d513f8eddb0bbae6689010e5ad..0ed548a1030f198f11630208723c20907718acff 100644
--- a/man/SeriesAggreg.Rd
+++ b/man/SeriesAggreg.Rd
@@ -37,7 +37,6 @@ YearFirstMonth = 1, TimeLag = 0, \dots)
                             ConvertFun,
                             NewTimeFormat = NULL,
                             simplify = FALSE,
-                            DatesR = NULL,
                             except = NULL,
                             recursive = TRUE,
                             \dots)
@@ -65,8 +64,6 @@ YearFirstMonth = 1, TimeLag = 0, \dots)
 
 \item{simplify}{(optional) [boolean] if set to \code{TRUE}, a \code{\link{data.frame}} is returned instead of a \code{\link{list}}. Embedded lists are then ignored. Default = \code{FALSE}}
 
-\item{DatesR}{(optional) [POSIXt] with the vector of dates if the dates are not provided in the argument \code{TabSeries}.}
-
 \item{except}{(optional) [character] the name of the items to skip in the aggregation (default: \code{NULL})}
 
 \item{recursive}{(optional) [boolean] if set to \code{FALSE}, embedded lists and dataframes are not aggregated (Default \code{TRUE})}