Support quoted tab-separated input with US date format

Parse dates in M/D/YYYY H:MM:SS AM/PM format in addition to the
ISO format used in the cleaned-up test data.

src/invoice_generator.rs

@@ -43,7 +43,9 @@ fn get_field(record: &csv::StringRecord, index: usize) -> &str {
 impl Transaction {
     pub fn from_record(record: &csv::StringRecord) -> Option<Self> {
         let date_str = get_field(record, 0);
-        let date = NaiveDateTime::parse_from_str(date_str, "%Y-%m-%d %H:%M:%S").ok()?;
+        let date = NaiveDateTime::parse_from_str(date_str, "%m/%d/%Y %I:%M:%S %p")
+            .or_else(|_| NaiveDateTime::parse_from_str(date_str, "%Y-%m-%d %H:%M:%S"))
+            .ok()?;
 
         Some(Transaction {
             date,