Function parse_time 

pub fn parse_time(time_str: &str) -> Result<DateTime<Utc>, TimeError>

Parse human-readable time string to DateTime<Utc>.

Supports relative formats:

• "7d", "7 days" — days ago
• "2h", "2hr" — hours ago
• "30m", "30min" — minutes ago
• "30s" — seconds ago

And absolute formats:

• "2024-05-01" — date-only (midnight UTC)
• "2024-05-01 10:00" — date and hour:minute
• "2024-05-01 10:00:00" — date and hour:minute:second

Errors

Returns TimeError::EmptyInput, TimeError::UnknownSuffix, TimeError::InvalidNumber, or TimeError::InvalidDate.