What is your issue?

I looked a bit into the frequency string update & found 3 issues we could improve upon.

1. Apart from "M", pandas also deprecated "Y", and "Q", in favor of "YE" and "QE". (And they are discussing renaming "MS" to "MB"). Should we do the same?

2. Should we translate the new freq strings to the old ones if pandas < 2.2 is installed? Otherwise we get the following situation:

   import xarray as xr
   xr.date_range("1600-02-01", periods=3, freq="M") # deprecation warning
   xr.date_range("1600-02-01", periods=3, freq="ME") # ValueError: Invalid frequency: ME

3. date_range_like can emit deprecation warnings without a way to mitigate them if pandas < 2.2 is installed. (When a DatetimeIndex) is passed. Could be nice to translate the old freq string to the new one without a warning.

I have played around with 2. and 3. and can open a PR if you are on board.

@spencerkclark @aulemahal

• DEPR offsets: rename ‘Y’ to ‘YE' pandas-dev/pandas#55792
• DEPR offsets: rename 'Q' to 'QE' pandas-dev/pandas#55553
• DEPR: rename offset alias ‘MS’ to ‘MB’ pandas-dev/pandas#56840