Filmmaker Kateryna Gornostai takes us to classrooms all over Ukraine in her latest documentary, as children and teenagers continue their education despite the ongoing Russian aggression. Amid the rubble and air raid sirens, "Timestamp" reveals the unwavering commitment of teachers to convey lifesaving, practical information as well as encouraging joy, beauty and laughter. Kateryna tells us about the reality of filming in an active conflict zone and why the war represents an existential attack on the very notion of Ukrainian identity.