Function system_time_from_date_and_adjuster

pub fn system_time_from_date_and_adjuster(
    date: &str,
    days_adjuster: Option<&str>,
) -> Result<SystemTime>

Convert from date and an optional days adjuster to SystemTime. Days adjuster is of form y[y…] to SystemTime. Each “y” will deduct 1 day from the resulting time.