Fix a number of new Chrono deprecations

Most warnings are raised in our test code, where the older API didn't
consider possible failures.

src/allocation.rs

@@ -99,19 +99,19 @@ mod tests {
     #[test]
     #[should_panic(expected = "You were born in the future?")]
     fn test_future_birthday() {
-        let birthday = NaiveDate::from_ymd(2095, 6, 14);
+        let birthday = NaiveDate::from_ymd_opt(2095, 6, 14).unwrap();
         age_in_weeks(birthday);
     }
 
     #[test]
     fn test_bond_allocation_ancient_investor() {
-        let birthday = NaiveDate::from_ymd(1863, 11, 19);
+        let birthday = NaiveDate::from_ymd_opt(1863, 11, 19).unwrap();
         assert_eq!(bond_allocation(birthday, 100), Decimal::from(1));
     }
 
     #[test]
     fn test_bond_allocation_very_young_investor() {
-        let birthday = NaiveDate::from_ymd(2018, 12, 30);
+        let birthday = NaiveDate::from_ymd_opt(2018, 12, 30).unwrap();
         assert_eq!(bond_allocation(birthday, 130), Decimal::from(0));
     }
 

src/compounding.rs

@@ -40,14 +40,14 @@ mod tests {
 
     #[test]
     fn test_banking_years() {
-        let current_date = NaiveDate::from_ymd(2019, 4, 18);
-        let future_date = NaiveDate::from_ymd(2095, 4, 18);
+        let current_date = NaiveDate::from_ymd_opt(2019, 4, 18).unwrap();
+        let future_date = NaiveDate::from_ymd_opt(2095, 4, 18).unwrap();
         assert_eq!(banking_years(current_date, future_date), 76.0);
     }
 
     #[test]
     fn test_compounding() {
-        let future_date = NaiveDate::from_ymd(2055, 4, 18);
+        let future_date = NaiveDate::from_ymd_opt(2055, 4, 18).unwrap();
         let total = compound(Decimal::from(100_000), 0.07, future_date);
         assert!(total > Decimal::from(100_000));
         // TODO: This value is hard-coded from today's date (July 9, 2019)

src/config.rs

@@ -82,13 +82,19 @@ mod tests {
         let user = User {
             birthday: String::from("1962-12-31"),
         };
-        assert_eq!(user.birthday(), NaiveDate::from_ymd(1962, 12, 31));
+        assert_eq!(
+            user.birthday(),
+            NaiveDate::from_ymd_opt(1962, 12, 31).unwrap()
+        );
     }
 
     #[test]
     fn test_parse_from_toml() {
         let conf = Config::from_file("example_config.toml");
-        assert_eq!(conf.user_birthday(), NaiveDate::from_ymd(1972, 7, 12));
+        assert_eq!(
+            conf.user_birthday(),
+            NaiveDate::from_ymd_opt(1972, 7, 12).unwrap()
+        );
         assert_eq!(&conf.gnucash.path_to_book, "/home/linus/sqlite3.gnucash");
         assert_eq!(&conf.gnucash.file_format, "sqlite3");
         assert_eq!(conf.gnucash.update_prices, true);

src/dateutil.rs

@@ -19,7 +19,7 @@ pub fn localize_from_dt_with_tz(datestring: &str) -> ParseResult<DateTime<Local>
 // In SQLite, all datetimes are UTC, but without timezone explicitly stated!
 pub fn utc_to_datetime(datestring: &str) -> DateTime<Local> {
     let dt = NaiveDateTime::parse_from_str(datestring, GNUCASH_NO_DT_FORMAT).unwrap();
-    let utc = DateTime::<Utc>::from_utc(dt, Utc);
+    let utc = DateTime::<Utc>::from_naive_utc_and_offset(dt, Utc);
     utc.with_timezone(&Local)
 }