Function parse_datetime_string_cursor 

pub fn parse_datetime_string_cursor(
    value: Option<DateTime<Utc>>,
    id: Option<String>,
    value_name: &str,
) -> Result<Option<(DateTime<Utc>, String)>>

Validates a timestamp plus string id cursor pair.

Errors

Returns an error when only one cursor component is present or the string id is blank.