humantime_to_duration

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

Features

• Parses a variety of human-readable 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:

[dependencies]
humantime_to_duration = "0.3.0"

Then, import the crate and use the from_str and from_str_at_date functions:

use humantime_to_duration::{from_str, from_str_at_date};
use chrono::Duration;

let duration = from_str("+3 days");
assert_eq!(duration.unwrap(), Duration::days(3));

let today = Utc::today().naive_utc();
let yesterday = today - Duration::days(1);
assert_eq!(
    from_str_at_date(yesterday, "2 days").unwrap(),
    Duration::days(1)
);

Supported Formats

The from_str and from_str_at_date functions support the following formats for relative time:

• num unit (e.g., "-1 hour", "+3 days")
• unit (e.g., "hour", "day")
• "now" or "today"
• "yesterday"
• "tomorrow"
• use "ago" for the past
• combined units with "and" or "," (e.g., "2 years and 1 month", "1 day, 2 hours" or "2 weeks 1 second")

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

The from_str and from_str_at_date functions return:

• Ok(Duration) - If the input string can be parsed as a relative time
• Err(ParseDurationError) - If the input string cannot be parsed as a relative time

This function will return Err(ParseDurationError::InvalidInput) if the input string cannot be parsed as a relative time.

Fuzzer

To run the fuzzer:

$ cargo fuzz run fuzz_from_str

License

This project is licensed under the MIT License.