Remove 'Y' and 'M' from DatetimeUnitOptions (#10306)

Author: spencerkclark

xarray/core/dataarray.py

@@ -5446,7 +5446,7 @@ def integrate(
         ----------
         coord : Hashable, or sequence of Hashable
             Coordinate(s) used for the integration.
-        datetime_unit : {'Y', 'M', 'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
+        datetime_unit : {'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
                         'ps', 'fs', 'as', None}, optional
             Specify the unit if a datetime coordinate is used.
 
@@ -5503,7 +5503,7 @@ def cumulative_integrate(
         ----------
         coord : Hashable, or sequence of Hashable
             Coordinate(s) used for the integration.
-        datetime_unit : {'Y', 'M', 'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
+        datetime_unit : {'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
                         'ps', 'fs', 'as', None}, optional
             Specify the unit if a datetime coordinate is used.
 

xarray/core/dataset.py

@@ -8247,7 +8247,7 @@ def differentiate(
             The coordinate to be used to compute the gradient.
         edge_order : {1, 2}, default: 1
             N-th order accurate differences at the boundaries.
-        datetime_unit : None or {"Y", "M", "W", "D", "h", "m", "s", "ms", \
+        datetime_unit : None or {"W", "D", "h", "m", "s", "ms", \
             "us", "ns", "ps", "fs", "as", None}, default: None
             Unit to compute gradient. Only valid for datetime coordinate.
 
@@ -8315,7 +8315,7 @@ def integrate(
         ----------
         coord : hashable, or sequence of hashable
             Coordinate(s) used for the integration.
-        datetime_unit : {'Y', 'M', 'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
+        datetime_unit : {'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
                         'ps', 'fs', 'as', None}, optional
             Specify the unit if datetime coordinate is used.
 
@@ -8439,7 +8439,7 @@ def cumulative_integrate(
         ----------
         coord : hashable, or sequence of hashable
             Coordinate(s) used for the integration.
-        datetime_unit : {'Y', 'M', 'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
+        datetime_unit : {'W', 'D', 'h', 'm', 's', 'ms', 'us', 'ns', \
                         'ps', 'fs', 'as', None}, optional
             Specify the unit if datetime coordinate is used.
 

xarray/core/types.py

@@ -254,7 +254,7 @@ def copy(
 InterpOptions = Union[Interp1dOptions, InterpolantOptions, InterpnOptions]
 
 DatetimeUnitOptions = Literal[
-    "Y", "M", "W", "D", "h", "m", "s", "ms", "us", "μs", "ns", "ps", "fs", "as", None
+    "W", "D", "h", "m", "s", "ms", "us", "μs", "ns", "ps", "fs", "as", None
 ]
 NPDatetimeUnitOptions = Literal["D", "h", "m", "s", "ms", "us", "ns"]
 PDDatetimeUnitOptions = Literal["s", "ms", "us", "ns"]