diff --git a/src/lib/ebus/datatype.cpp b/src/lib/ebus/datatype.cpp
index 909b8f96..ed8339b9 100644
--- a/src/lib/ebus/datatype.cpp
+++ b/src/lib/ebus/datatype.cpp
@@ -995,6 +995,7 @@ DataTypeList::DataTypeList()
 	add(new DateTimeDataType("MIN", 16, SPE, 0xff, false, true, 0)); // time, minutes since last midnight, 00:00 - 24:00 (minutes + hour * 60 as integer)
 	add(new DateTimeDataType("TTM", 8, 0, 0x90, false, true, 10)); // truncated time (only multiple of 10 minutes), 00:00 - 24:00 (minutes div 10 + hour * 6 as integer)
 	add(new DateTimeDataType("TTH", 8, 0, 0, false, true, 30)); // truncated time (only multiple of 30 minutes), 00:00 - 24:00 (minutes div 30 + hour * 2 as integer)
+	add(new DateTimeDataType("TTQ", 8, 0, 0, false, true, 15)); // truncated time (only multiple of 15 minutes), 00:00 - 24:00 (minutes div 15 + hour * 4 as integer)
 	add(new NumberDataType("BDY", 8, DAY, 0x07, 0, 6, 1)); // weekday, "Mon" - "Sun" (0x00 - 0x06) [eBUS type]
 	add(new NumberDataType("HDY", 8, DAY, 0x00, 1, 7, 1)); // weekday, "Mon" - "Sun" (0x01 - 0x07) [Vaillant type]
 	add(new NumberDataType("BCD", 8, BCD, 0xff, 0, 99, 1)); // unsigned decimal in BCD, 0 - 99
diff --git a/src/lib/ebus/test/test_data.cpp b/src/lib/ebus/test/test_data.cpp
index 3bdefc84..d36d7844 100644
--- a/src/lib/ebus/test/test_data.cpp
+++ b/src/lib/ebus/test/test_data.cpp
@@ -168,6 +168,15 @@ int main()
 		{"x,,tth", "-:-",   "10fe07000100",   "00", ""},
 		{"x,,tth", "",      "10fe07000131",   "00", "rw"},
 		{"x,,tth,2", "",    "",               "",   "c"},
+		{"x,,ttq", "22:30", "10fe0700015a",   "00", ""},
+		{"x,,ttq", "00:30", "10fe07000102",   "00", ""},
+		{"x,,ttq", "23:31", "10fe0700015e",   "00", "R"},
+		{"x,,ttq", "23:44", "10fe0700015f",   "00", "R"},
+		{"x,,ttq", "23:45", "10fe0700015f",   "00", ""},
+		{"x,,ttq", "24:00", "10fe07000160",   "00", ""},
+		{"x,,ttq", "-:-",   "10fe07000100",   "00", ""},
+		{"x,,ttq", "",      "10fe07000161",   "00", "rw"},
+		{"x,,ttq,2", "",    "",               "",   "c"},
 		{"x,,bdy", "Mon",   "10fe07000100",   "00", ""},
 		{"x,,bdy", "Sun",   "10fe07000106",   "00", ""},
 		{"x,,bdy", "8",     "10fe07000108",   "00", "w"},