fix: adjust dtypes for get_statements_range cache (#63)

Author: hiohiohio

jquantsapi/client.py

@@ -832,7 +832,19 @@ def get_statements_range(
                 if (cache_dir != "") and os.path.isfile(
                     f"{cache_dir}/{yyyy}/{cache_file}"
                 ):
-                    df = pd.read_csv(f"{cache_dir}/{yyyy}/{cache_file}")
+                    df = pd.read_csv(f"{cache_dir}/{yyyy}/{cache_file}", dtype=str)
+                    df["DisclosedDate"] = pd.to_datetime(
+                        df["DisclosedDate"], format="%Y-%m-%d"
+                    )
+                    df["CurrentPeriodEndDate"] = pd.to_datetime(
+                        df["CurrentPeriodEndDate"], format="%Y-%m-%d"
+                    )
+                    df["CurrentFiscalYearStartDate"] = pd.to_datetime(
+                        df["CurrentFiscalYearStartDate"], format="%Y-%m-%d"
+                    )
+                    df["CurrentFiscalYearEndDate"] = pd.to_datetime(
+                        df["CurrentFiscalYearEndDate"], format="%Y-%m-%d"
+                    )
                     buff.append(df)
                 else:
                     future = executor.submit(