Timing to_datetime(): Datetime format: %m-%d-%Y --------------- Without infer_format: cad7e6333f1cd2ebe272d7fc7553cd27 - 3.082s With infer_format: cad7e6333f1cd2ebe272d7fc7553cd27 - 0.268s (11.51x baseline) Passing the format: cad7e6333f1cd2ebe272d7fc7553cd27 - 0.267s (11.54x baseline) Datetime format: %m/%d/%Y %H:%M:%S.%f --------------- Without infer_format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 5.162s With infer_format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 0.501s (10.31x baseline) Passing the format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 0.509s (10.14x baseline) Datetime format: %Y-%m-%dT%H:%M:%S.%f --------------- Without infer_format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 0.013s With infer_format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 0.012s (1.06x baseline) Passing the format: ec2ef27adb2e95e2c5386d8d5d8513a1 - 0.491s (0.03x baseline) Testing reading CSV: Datetime format: %m-%d-%Y --------------- Without infer_format: e8bde3ae42c769a7509cb94e9f36ca5e - 3.085s With infer_format: e8bde3ae42c769a7509cb94e9f36ca5e - 0.298s (10.37x baseline) With strptime date_parser: e8bde3ae42c769a7509cb94e9f36ca5e - 0.906s (3.41x baseline) Datetime format: %m/%d/%Y %H:%M:%S.%f --------------- Without infer_format: 2f7019b7f7795146b4de4e83fbc0ebb5 - 5.230s With infer_format: 2f7019b7f7795146b4de4e83fbc0ebb5 - 0.555s (9.42x baseline) With strptime date_parser: 2f7019b7f7795146b4de4e83fbc0ebb5 - 1.245s (4.20x baseline) Datetime format: %Y-%m-%dT%H:%M:%S.%f --------------- Without infer_format: f0028f10cf5d2fc66900e1a57d5bbf9a - 0.073s With infer_format: f0028f10cf5d2fc66900e1a57d5bbf9a - 0.062s (1.19x baseline) With strptime date_parser: f0028f10cf5d2fc66900e1a57d5bbf9a - 1.249s (0.06x baseline)