sql_tools 0.11.10

A rust crate meant to make SQL queries simple and communication between various SQL versions easy.
Documentation 
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use chrono::NaiveDate;

pub fn date_conversion(input: &mut String) -> Result<NaiveDate, String> {
    let string = &input.replace("/", "-").replace(".", "-").trim().to_string();
    match string.len() {
        10 => match string {
            // mm/dd/yyyy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[5..6] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%Y") {
                    Ok(date) => return Ok(date),
                    // dd/mm/yyyy
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%d-%m-%Y") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            // yyyy/mm/dd
            string_to_date if &string_to_date[4..5] == "-" && &string_to_date[7..8] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%Y-%m-%d") {
                    Ok(date) => return Ok(date),
                    // yyyy/dd/mm
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%Y-%d-%m") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            _ => return Err(input.clone()),
        },
        9 => match string {
            // m/dd/yyyy
            string_to_date if &string_to_date[1..2] == "-" && &string_to_date[4..5] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%Y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            // mm/d/yyyy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[4..5] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%Y") {
                    Ok(date) => return Ok(date),
                    // dd/m/yyyy
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%d-%m-%Y") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            // yyyy/mm/d
            string_to_date if &string_to_date[4..5] == "-" && &string_to_date[7..8] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%Y-%m-%d") {
                    Ok(date) => return Ok(date),
                    // yyyy/dd/m
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%Y-%d-%m") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            // yyyy/m/dd
            string_to_date if &string_to_date[4..5] == "-" && &string_to_date[6..7] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%Y-%m-%d") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            _ => return Err(input.clone()),
        },
        8 => match string {
            // m/d/yyyy
            string_to_date if &string_to_date[1..2] == "-" && &string_to_date[3..4] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%Y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            // yyyy/m/d
            string_to_date if &string_to_date[4..5] == "-" && &string_to_date[6..7] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%Y-%m-%d") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            // mm/dd/yy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[5..6] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%y") {
                    Ok(date) => return Ok(date),
                    // dd/mm/yy
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%d-%m-%y") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            _ => return Err(input.clone()),
        },
        7 => match string {
            // m/dd/yy
            string_to_date if &string_to_date[1..2] == "-" && &string_to_date[4..5] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            // mm/d/yy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[4..5] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%y") {
                    Ok(date) => return Ok(date),
                    // dd/m/yy
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%d-%m-%y") {
                        Ok(date) => return Ok(date),
                        // yy/m/dd
                        Err(_) => match NaiveDate::parse_from_str(string_to_date, "%y-%m-%d") {
                            Ok(date) => return Ok(date),
                            Err(_) => return Err(input.clone()),
                        },
                    },
                }
            }
            // yy/mm/d
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[5..6] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%y-%m-%d") {
                    Ok(date) => return Ok(date),
                    // yy/dd/m
                    Err(_) => match NaiveDate::parse_from_str(string_to_date, "%y-%d-%m") {
                        Ok(date) => return Ok(date),
                        Err(_) => return Err(input.clone()),
                    },
                }
            }
            _ => return Err(input.clone()),
        },
        6 => match string {
            // m/d/yy
            string_to_date if &string_to_date[1..2] == "-" && &string_to_date[3..4] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%m-%d-%y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            // yy/m/d
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[4..5] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%y-%m-%d") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            _ => return Err(input.clone()),
        },
        _ => return Err(input.clone()),
    }
}

pub fn date_w_abbrv_conversion(input: &mut String) -> Result<NaiveDate, String> {
    let string = &input.replace("/", "-").replace(".", "-").trim().to_string();
    match string.len() {
        11 => match string {
            // dd/mmm/yyyy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[6..7] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%d-%b-%Y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            _ => return Err(input.clone()),
        },
        9 => match string {
            // dd/mmm/yy
            string_to_date if &string_to_date[2..3] == "-" && &string_to_date[6..7] == "-" => {
                match NaiveDate::parse_from_str(string_to_date, "%d-%b-%y") {
                    Ok(date) => return Ok(date),
                    Err(_) => return Err(input.clone()),
                }
            }
            _ => return Err(input.clone()),
        },
        _ => return Err(input.clone()),
    }
}