Since pandas represents timestamps in nanosecond resolution, the time span that can be represented using a 64-bit integer is limited to approximately 584 years:
In [68]: pd.Timestamp.minOut[68]: Timestamp('1677-09-21 00:12:43.145225')In [69]: pd.Timestamp.maxOut[69]: Timestamp('2262-04-11 23:47:16.854775807')