Raga Khamaj belongs to Khamaj Thaat. It is rendered in the late evening and uses all seven notes, six in the ascent and seven in the descent. It uses both komal (flat) and shuddha (full) Nishad, and all other notes are shuddha (full). The derivative ragas out of this structure are grouped under the broad head of Khamaj Thaat.
Thaat : Khamaj
Samay : Night