import datetime
ts = 1649635200
dt = datetime.datetime.utcfromtimestamp(ts)
print(dt) # 2022-04-11 00:00:00const ts = 1649635200;
const date = new Date(ts * 1000);
console.log(date.toISOString());
// 2022-04-11T00:00:00.000Zimport java.time.Instant;
import java.time.ZoneOffset;
long ts = 1649635200L;
Instant instant = Instant.ofEpochSecond(ts);
System.out.println(instant);
// 2022-04-11T00:00:00.000Z