This document discusses apparatus and methods for compensating non-linearity of digital-to-time converters (DTCs). In an example, a wireless device can include a digital-to-time converter (DTC) configured to receive a phase data information from a baseband processor and to provide a first modulation signal for generating a wireless signal, a detector configure to receive the first modulation signal and provide an indication of nonlinearities of the DTC, and a pre-distortion module configured to provide pre-distortion information to the DTC using the indication of nonlinearities.