wrong calculation of .ceil() and .floor() #145
Description
let epoch = Epoch::from_unix_milliseconds(600f64);
println!("epoch {}", epoch);
println!("epoch {}", epoch .ceil(3.minutes()));
println!("epoch {}", epoch .floor(3.minutes()));
let epoch = Epoch::now().unwrap();//::from_unix_milliseconds(600f64);
println!("epoch {}", epoch);
println!("epoch {}", epoch .ceil(3.minutes()));
println!("epoch {}", epoch .floor(3.minutes()));creates
epoch 1970-01-01T00:00:00.599999904 UTC
epoch 1970-01-01T00:03:00 UTC
epoch 1970-01-01T00:00:00 UTC
epoch 2022-10-03T17:44:29.898032665 UTC
epoch 2022-10-03T17:47:23 UTC # error
epoch 2022-10-03T17:44:23 UTC # error