  Charge-Parity-Time (CPT) symmetry governs that the oscillation parameters for
neutrinos and anti-neutrinos are to be identical. Different mass and mixing
parameters for these particles may give us a possible hint for CPT violation in
the neutrino sector. Using this approach, we discuss the ability of
long-baseline and atmospheric neutrino experiments to determine the difference
between mass squared splittings ($\Delta m^{2}_{32}-\Delta\bar{m}^{2}_{32}$)
and atmospheric mixing angles ($\sin^{2}\theta_{23}-\sin^{2}\bar{\theta}_{23}$)
of neutrinos and anti-neutrinos. We show the joint sensitivity of the T2K, NOvA
and INO experiments to such CPT violating observables in different possible
combinations of octant for neutrinos and anti-neutrinos.
