diff --git a/R/derive_var_extreme_date.R b/R/derive_var_extreme_date.R
index 82c4d6afbe..28a348a495 100644
--- a/R/derive_var_extreme_date.R
+++ b/R/derive_var_extreme_date.R
@@ -649,6 +649,17 @@ date_source <- function(dataset_name,
                         filter = NULL,
                         date,
                         set_values_to = NULL) {
+
+  deprecate_inform(
+    when = "1.2.0",
+    what = "date_source()",
+    with = "derive_vars_extreme_event()",
+    details = c(
+      x = "This message will turn into a warning with release of 1.3.0",
+      i = "https://pharmaverse.github.io/admiral/reference/derive_vars_extreme_event.html"
+    )
+  )
+
   out <- list(
     dataset_name = assert_character_scalar(dataset_name),
     filter = assert_filter_cond(enexpr(filter), optional = TRUE),
diff --git a/tests/testthat/_snaps/derive_var_extreme_date.md b/tests/testthat/_snaps/derive_var_extreme_date.md
index 8b84862f9a..a8f6c95aed 100644
--- a/tests/testthat/_snaps/derive_var_extreme_date.md
+++ b/tests/testthat/_snaps/derive_var_extreme_date.md
@@ -8,6 +8,10 @@
       i Please use `derive_vars_extreme_event()` instead.
       x This message will turn into a warning with release of 1.3.0
       i https://pharmaverse.github.io/admiral/reference/derive_vars_extreme_event.html
+      `derive_var_extreme_dtm()` was deprecated in admiral 1.2.0.
+      i Please use `derive_vars_extreme_event()` instead.
+      x This message will turn into a warning with release of 1.3.0
+      i https://pharmaverse.github.io/admiral/reference/derive_vars_extreme_event.html
     Output
       # A tibble: 3 x 6
         STUDYID USUBJID TRTEDTM             DTHDTC  DTHDT      LSTALVDT  
@@ -16,7 +20,7 @@
       2 STUDY01 2       NA                  2020-06 2020-06-01 NA        
       3 STUDY01 3       2020-04-12 13:15:00 <NA>    NA         2020-04-12
 
-# derive_var_extreme_dtm Test 4: Message sent to users
+# derive_var_extreme_dtm Test 5: Message sent to users
 
     Code
       derive_var_extreme_dtm(adsl, new_var = LSTALVDTM, source_datasets = list(ae = ae,
@@ -35,7 +39,7 @@
       3 STUDY01 3       2020-04-12 13:15:00 <NA>    NA         ADSL         NA TRTEDTM
       # i 1 more variable: LSTALVDTM <dttm>
 
-# derive_var_extreme_dtm Test 6: error if source dataset is not available
+# derive_var_extreme_dtm Test 8: error if source dataset is not available
 
     Code
       derive_var_extreme_dtm(adsl, new_var = LSTALVDTM, source_datasets = list(ea = ae),