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Timestamp: a fixed time.
Fixed period period.
Time interval nterval: It is represented by the start time and end time. The fixed period is a special time interval.
The role of time and date in pandas:
1. Analyze financial data, such as stocks;
2. Analyze server logs.
Date and time
Query time
Query specific year, month, day
Calculation interval
Calculate the future time from the present time
Conversion between strings
Create a list with datetime
Timestamp
period
period sequence
quarter
Conversion between Timestamp and Period
Time series of timestamps converted to periods
Re-sampling
Resample every five minutes
Groupby resampling implements monthly resampling
Upsampling
Convert week to day and interpolate forward
Period resampling
Resample to years
