Add a way to shift a TimeSeries by a given time delta but keep track of this

[samaloney]

Describe the feature

With data from multiple locations in the heliosphere it is often necessary to shift timesseries data by a correction due to propagation (light travel time, particle travel time etc) and this is often done in an adhoc manner which can be very error prone e.g.

my_ts = TimeSeries(....)

my_ts_df = my_ts.to_dataframe()
my_ts_df.index = my_ts_df.index - pd.TimeDelta(minutes=5)
my_ts_shifted_df = my_ts_df.index = my_ts_df.index - pd.TimeDelta(minutes=5)

Proposed solution

Could a time_shift property or similar be added to TimeSeries which where the plot labels/titles are updated to indicate the shift.

One could then check if a TimeSeries is shifted or not with my_ts.time_shift and set a time shift with my_ts.time_shift = -5 u.min?