diff --git a/silkaj/constants.py b/silkaj/constants.py
index f941a370a8d9b361e2fc0e999778043de7a882c7..2149e3ec1c329f449f6a8c95109e29fd06e277c3 100644
--- a/silkaj/constants.py
+++ b/silkaj/constants.py
@@ -32,3 +32,7 @@ MINIMAL_ABSOLUTE_TX_AMOUNT = 0.01
 MINIMAL_RELATIVE_TX_AMOUNT = 1e-6
 CENT_MULT_TO_UNIT = 100
 SHORT_PUBKEY_SIZE = 8
+# pendulum constants
+DATE = "YYYY-MM-DD"
+HOUR = "hh:mm:ss"
+ALL = DATE + " " + HOUR