diff --git a/docs/ssb_konjunk.rst b/docs/ssb_konjunk.rst
index 0ecbe8e..649c439 100644
--- a/docs/ssb_konjunk.rst
+++ b/docs/ssb_konjunk.rst
@@ -49,7 +49,7 @@ ssb\_konjunk.xml\_handling module
    :members:
    :undoc-members:
    :show-inheritance:
-   
+
 ssb\_konjunk.rounding module
 ---------------------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index 2a7ed85..f801247 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ssb-konjunk"
-version = "0.1.11"
+version = "0.1.12"
 description = "SSB Konjunk"
 authors = ["Edvard Garmannslund <ged@ssb.no>"]
 license = "MIT"
diff --git a/src/ssb_konjunk/timestamp.py b/src/ssb_konjunk/timestamp.py
index 2b6a5b7..69a08a9 100644
--- a/src/ssb_konjunk/timestamp.py
+++ b/src/ssb_konjunk/timestamp.py
@@ -196,6 +196,8 @@ def _get_timestamp_special(*args: int, frequency: str) -> str | None:
     if frequency in ["M", "W"]:
         if frequency == "M":
             frequency = "-"
+        if frequency == "W":
+            frequency = "-W"
         if len(args) == 2:
             return f"p{args[0]}{frequency}{args[1]:02}"
         elif len(args) == 4:
@@ -204,7 +206,10 @@ def _get_timestamp_special(*args: int, frequency: str) -> str | None:
             )
         else:
             return None
+
     else:
+        if frequency in ["Q", "B", "T", "H"]:
+            frequency = f"-{frequency}"
         if len(args) == 2:
             return f"p{args[0]}{frequency}{args[1]}"
         elif len(args) == 4:
diff --git a/tests/test_timestamp.py b/tests/test_timestamp.py
index 7d6ae9d..bd3db5d 100644
--- a/tests/test_timestamp.py
+++ b/tests/test_timestamp.py
@@ -45,31 +45,35 @@ def test_test_get_timestamp_special() -> None:
         _get_timestamp_special(2020, 1, 2021, 2, frequency="M") == "p2020-01_p2021-02"
     )
     # Testing quarter
-    assert _get_timestamp_special(2020, 1, 2021, 2, frequency="Q") == "p2020Q1_p2021Q2"
+    assert (
+        _get_timestamp_special(2020, 1, 2021, 2, frequency="Q") == "p2020-Q1_p2021-Q2"
+    )
     # Testing term
-    assert _get_timestamp_special(2020, 1, 2021, 2, frequency="B") == "p2020B1_p2021B2"
+    assert (
+        _get_timestamp_special(2020, 1, 2021, 2, frequency="B") == "p2020-B1_p2021-B2"
+    )
 
 
 def test_get_ssb_timestamp() -> None:
     """Test of function get_ssb_timestamp."""
     # Testing week
-    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="W") == "p2020W01_p2021W02"
-    assert get_ssb_timestamp(2020, 1, frequency="W") == "p2020W01"
+    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="W") == "p2020-W01_p2021-W02"
+    assert get_ssb_timestamp(2020, 1, frequency="W") == "p2020-W01"
     # Testing month
     assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="M") == "p2020-01_p2021-02"
     assert get_ssb_timestamp(2020, 1) == "p2020-01"
     # Testing quarter
-    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="Q") == "p2020Q1_p2021Q2"
-    assert get_ssb_timestamp(2020, 1, frequency="Q") == "p2020Q1"
+    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="Q") == "p2020-Q1_p2021-Q2"
+    assert get_ssb_timestamp(2020, 1, frequency="Q") == "p2020-Q1"
     # Testing term
-    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="B") == "p2020B1_p2021B2"
-    assert get_ssb_timestamp(2020, 1, frequency="B") == "p2020B1"
+    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="B") == "p2020-B1_p2021-B2"
+    assert get_ssb_timestamp(2020, 1, frequency="B") == "p2020-B1"
     # Testing trimester
-    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="T") == "p2020T1_p2021T2"
-    assert get_ssb_timestamp(2020, 1, frequency="T") == "p2020T1"
+    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="T") == "p2020-T1_p2021-T2"
+    assert get_ssb_timestamp(2020, 1, frequency="T") == "p2020-T1"
     # Testing half year
-    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="H") == "p2020H1_p2021H2"
-    assert get_ssb_timestamp(2020, 1, frequency="H") == "p2020H1"
+    assert get_ssb_timestamp(2020, 1, 2021, 2, frequency="H") == "p2020-H1_p2021-H2"
+    assert get_ssb_timestamp(2020, 1, frequency="H") == "p2020-H1"
     # Testing day
     assert (
         get_ssb_timestamp(2020, 1, 1, 2020, 1, 31, frequency="D")