diff --git a/common/python/nomadcore/unit_conversion/units.txt b/common/python/nomadcore/unit_conversion/units.txt
index 30fd2ca94b7add2aa63c28a398368a9a5dab32bf..c53b9bb6b04356bfb50b412c2b3d25d42ae811f6 100644
--- a/common/python/nomadcore/unit_conversion/units.txt
+++ b/common/python/nomadcore/unit_conversion/units.txt
@@ -253,6 +253,7 @@ minute = 60 * second = min
 hour = 60 * minute = hr
 day = 24 * hour
 week = 7 * day
+timeAu = hbar / hartree
 
 # Velocity
 [speed] = [length] / [time]