# parse_datetime

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A Rust crate for parsing human-readable relative time strings and human-readable datetime strings and converting them to a `DateTime`.

## Features

- Parses a variety of human-readable and standard time formats.
- Supports positive and negative durations.
- Allows for chaining time units (e.g., "1 hour 2 minutes" or "2 days and 2 hours").
- Calculate durations relative to a specified date.
- Relies on Chrono

## Usage

Add this to your `Cargo.toml`:

```toml
[dependencies]
parse_datetime = "0.4.0"
```

Then, import the crate and use the `parse_datetime_at_date` function:

```rs
use chrono::{Duration, Local};
use parse_datetime::parse_datetime_at_date;

let now = Local::now();
let after = parse_datetime_at_date(now, "+3 days");

assert_eq!(
  (now + Duration::days(3)).naive_utc(),
  after.unwrap().naive_utc()
);
```

For DateTime parsing, import the `parse_datetime` module:

```rs
use parse_datetime::parse_datetime::from_str;
use chrono::{Local, TimeZone};

let dt = from_str("2021-02-14 06:37:47");
assert_eq!(dt.unwrap(), Local.with_ymd_and_hms(2021, 2, 14, 6, 37, 47).unwrap());
```

### Supported Formats

The `parse_datetime` and `parse_datetime_at_date` functions support absolute datetime and the following relative times:

- `num` `unit` (e.g., "-1 hour", "+3 days")
- `unit` (e.g., "hour", "day")
- "now" or "today"
- "yesterday"
- "tomorrow"
- use "ago" for the past
- use "next" or "last" with `unit` (e.g., "next week", "last year")
- combined units with "and" or "," (e.g., "2 years and 1 month", "1 day, 2 hours" or "2 weeks 1 second")
- unix timestamps (for example "@0" "@1344000")

`num` can be a positive or negative integer.
`unit` can be one of the following: "fortnight", "week", "day", "hour", "minute", "min", "second", "sec" and their plural forms.

## Return Values

### parse_datetime and parse_datetime_at_date

The `parse_datetime` and `parse_datetime_at_date` function return:

- `Ok(DateTime<FixedOffset>)` - If the input string can be parsed as a datetime
- `Err(ParseDateTimeError::InvalidInput)` - If the input string cannot be parsed

## Fuzzer

To run the fuzzer:

```
$ cd fuzz
$ cargo install cargo-fuzz
$ cargo +nightly fuzz run fuzz_parse_datetime
```

## License

This project is licensed under the [MIT License](LICENSE).

## Note

At some point, this crate was called humantime_to_duration.
It has been renamed to cover more cases.
