datetime and timedelta
Numpy
Datetimes and Timedeltas — NumPy Manual
https://numpy.org/devdocs/reference/arrays.datetime.html
numpy.timedelta64で時刻データをチェック - Qiita
https://qiita.com/ColdFreak/items/8086741410b57c5af8c5
Tutorials
Time Series Analysis: Working With Date-Time Data In Python
https://blog.quantinsti.com/time-series-analysis-date-time-python/?utm_campaign=News&utm_medium=Community&utm_source=DataCamp.com
See also
dateutil