Function parse_duration 

pub fn parse_duration(duration: &str) -> Result<DateTime<Utc>>

Parse a duration string (e.g., “7d”, “24h”, “30m”) into a DateTime

Supported units:

• d: days
• h: hours
• m: minutes
• s: seconds
• w: weeks

Arguments

• duration - Duration string in format like “7d”, “24h”, “30m”, “5w”

Returns

A DateTime representing the current time minus the specified duration

Errors

Returns InvalidInput error if:

• Duration string is empty or too short
• Number part is not a valid integer
• Unit is not one of d/h/m/s/w

Examples

use crate::time_utils::parse_duration;

let seven_days_ago = parse_duration("7d").unwrap();
let one_week_ago = parse_duration("1w").unwrap();