Time handling.

driver/driver.go

@@ -118,6 +118,10 @@ func (s stmt) Query(args []driver.Value) (driver.Rows, error) {
 			err = s.stmt.BindBlob(i+1, a)
 		case time.Time:
 			err = s.stmt.BindText(i+1, a.Format(time.RFC3339Nano))
+		case nil:
+			err = s.stmt.BindNull(i + 1)
+		default:
+			panic(assertErr)
 		}
 		if err != nil {
 			return nil, err
@@ -167,9 +171,13 @@ func (r rows) Next(dest []driver.Value) error {
 		case sqlite3.FLOAT:
 			dest[i] = r.s.ColumnFloat(i)
 		case sqlite3.TEXT:
-			dest[i] = r.s.ColumnText(i)
+			dest[i] = maybeDate(r.s.ColumnText(i))
 		case sqlite3.BLOB:
 			dest[i] = r.s.ColumnBlob(i, nil)
+		case sqlite3.NULL:
+			dest[i] = nil
+		default:
+			panic(assertErr)
 		}
 	}
 

driver/error.go

@@ -0,0 +1,7 @@
+package driver
+
+type errorString string
+
+func (e errorString) Error() string { return string(e) }
+
+const assertErr = errorString("sqlite3: assertion failed")

driver/time.go

@@ -0,0 +1,19 @@
+package driver
+
+import (
+	"database/sql/driver"
+	"time"
+)
+
+// Convert a string in [time.RFC3339Nano] format into a [time.Time]
+// if it roundtrips back to the same string.
+// This way times can be persisted to, and recovered from, the database,
+// but if a string is needed, [database.sql] will recover the same string.
+// TODO: optimize and fuzz test.
+func maybeDate(text string) driver.Value {
+	date, err := time.Parse(time.RFC3339Nano, text)
+	if err == nil && date.Format(time.RFC3339Nano) == text {
+		return date
+	}
+	return text
+}