DOC: add example for tz_convert and tz_localize

Author: georeth

pandas/core/generic.py

@@ -10154,6 +10154,24 @@ def tz_convert(
         ------
         TypeError
             If the axis is tz-naive.
+
+        Examples
+        --------
+        Change to another time zone:
+
+        >>> s = pd.Series([1],
+        ...     index=pd.DatetimeIndex(['2018-09-15 01:30:00+02:00']))
+        >>> s.tz_convert('Asia/Shanghai')
+        2018-09-15 07:30:00+08:00    1
+        dtype: int64
+
+        Convert to UTC and get a tz-naive index:
+
+        >>> s = pd.Series([1],
+        ...     index=pd.DatetimeIndex(['2018-09-15 01:30:00+02:00']))
+        >>> s.tz_convert(None)
+        2018-09-14 23:30:00    1
+        dtype: int64
         """
         axis = self._get_axis_number(axis)
         ax = self._get_axis(axis)
@@ -10262,6 +10280,14 @@ def tz_localize(
         2018-09-15 01:30:00+02:00    1
         dtype: int64
 
+        Convert to tz-naive index and preserve local time:
+
+        >>> s = pd.Series([1],
+        ...     index=pd.DatetimeIndex(['2018-09-15 01:30:00+02:00']))
+        >>> s.tz_localize(None)
+        2018-09-15 01:30:00    1
+        dtype: int64
+
         Be careful with DST changes. When there is sequential data, pandas
         can infer the DST time: