You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: time_travel.rs
    path of file: ./repos/delta-rs/crates/core/tests
    
    the code of the file until where you have to start completion: use chrono::{DateTime, FixedOffset, Utc};
use std::path::Path;

#[tokio::test]
async fn time_travel_by_ds() {
    // git does not preserve mtime, so we need to manually set it in the test
    let log_dir = "../test/tests/data/simple_table/_delta_log";
    let log_mtime_pair = vec![
        ("00000000000000000000.json", "2020-05-01T22:47:31-07:00"),
        ("00000000000000000001.json", "2020-05-02T22:47:31-07:00"),
        ("00000000000000000002.json", "2020-05-03T22:47:31-07:00"),
        ("00000000000000000003.json", "2020-05-04T22:47:31-07:00"),
        ("00000000000000000004.json", "2020-05-05T22:47:31-07:00"),
    ];
    for (fname, ds) in log_mtime_pair {
        let ts = ds_to_ts(ds);
        utime::set_file_times(Path::new(log_dir).join(fname), ts, ts).unwrap();
    }

    let mut table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-01T00:47:31-07:00",
    )
    .await
    .unwrap();

    assert_eq!(table.version(), 0);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-02T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 1);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-02T23:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 1);

    table = deltalake_core::open_table_with_ds(
       
    
async fn time_travel_by_ds() {
    // git does not preserve mtime, so we need to manually set it in the test
    let log_dir = "../test/tests/data/simple_table/_delta_log";
    let log_mtime_pair = vec![
        ("00000000000000000000.json", "2020-05-01T22:47:31-07:00"),
        ("00000000000000000001.json", "2020-05-02T22:47:31-07:00"),
        ("00000000000000000002.json", "2020-05-03T22:47:31-07:00"),
        ("00000000000000000003.json", "2020-05-04T22:47:31-07:00"),
        ("00000000000000000004.json", "2020-05-05T22:47:31-07:00"),
    ];
    for (fname, ds) in log_mtime_pair {
        let ts = ds_to_ts(ds);
        utime::set_file_times(Path::new(log_dir).join(fname), ts, ts).unwrap();
    }

    let mut table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-01T00:47:31-07:00",
    )
    .await
    .unwrap();

    assert_eq!(table.version(), 0);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-02T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 1);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-02T23:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 1);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-03T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 2);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-04T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 3);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-05T21:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 3);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-05T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 4);

    table = deltalake_core::open_table_with_ds(
        "../test/tests/data/simple_table",
        "2020-05-25T22:47:31-07:00",
    )
    .await
    .unwrap();
    assert_eq!(table.version(), 4);
}