import datetime
ts = 409190400
dt = datetime.datetime.utcfromtimestamp(ts)
print(dt) # 1982-12-20 00:00:00const ts = 409190400;
const date = new Date(ts * 1000);
console.log(date.toISOString());
// 1982-12-20T00:00:00.000Zimport java.time.Instant;
import java.time.ZoneOffset;
long ts = 409190400L;
Instant instant = Instant.ofEpochSecond(ts);
System.out.println(instant);
// 1982-12-20T00:00:00.000Z