update

pandas-dev · jreback · Aug 12, 2022 · Jun 22, 2022 · Jun 22, 2022 · Jun 22, 2022
commit eba2fb92b097daba2a84ee7558e3dcdea3f2e6a1
diff --git a/doc/source/getting_started/install.rst b/doc/source/getting_started/install.rst
@@ -273,11 +273,15 @@ the method requiring that dependency is called.
 Timezones
 ^^^^^^^^^
 
-========================= ================== =============================================================
-Dependency                Minimum Version    Notes
-========================= ================== =============================================================
-tzdata                    2022.1             Allows the use of ``zoneinfo`` timezones with pandas
-========================= ================== =============================================================
+========================= ========================= =============================================================
+Dependency                Minimum Version           Notes
+========================= ========================= =============================================================
+tzdata                    2022.1(pypi)/             Allows the use of ``zoneinfo`` timezones with pandas.
+                          2022a(for system tzdata)  **Note**: You only need to install the pypi package, if your
+                                                    system does not already provide the IANA tz database.
+                                                    However, the minimum tzdata version still applies, even if it
+                                                    is not enforced through an error.
+========================= ========================= =============================================================
 
 Visualization
 ^^^^^^^^^^^^^

diff --git a/environment.yml b/environment.yml
@@ -48,7 +48,7 @@ dependencies:
   - scipy
   - sqlalchemy
   - tabulate
-  - tzdata>=2022.1
+  - tzdata>=2022a
   - xarray
   - xlrd
   - xlsxwriter

diff --git a/pandas/_libs/tslibs/timezones.pyx b/pandas/_libs/tslibs/timezones.pyx
@@ -9,7 +9,6 @@ try:
     # py39+
     import zoneinfo
     from zoneinfo import ZoneInfo
-    import_optional_dependency("tzdata", errors="raise", min_version="2022.1")
 except ImportError:
     zoneinfo = None
     ZoneInfo = None
@@ -70,6 +69,9 @@ cdef inline bint is_utc_zoneinfo(tzinfo tz):
             utc_zoneinfo = ZoneInfo("UTC")
         except zoneinfo.ZoneInfoNotFoundError:
             return False
+        # Warn if tzdata is too old, even if there is a system tzdata to alert
+        # users about the mismatch between local/system tzdata
+        import_optional_dependency("tzdata", errors="warn", min_version="2022.1")
 
     return tz is utc_zoneinfo
 

diff --git a/scripts/generate_pip_deps_from_conda.py b/scripts/generate_pip_deps_from_conda.py
@@ -21,6 +21,7 @@
 import yaml
 
 EXCLUDE = {"python", "c-compiler", "cxx-compiler"}
+REMAP_VERSION = {"tzdata": "2022.1"}
 RENAME = {"pytables": "tables", "geopandas-base": "geopandas", "pytorch": "torch"}
 
 
@@ -41,7 +42,8 @@ def conda_package_to_pip(package: str):
             pkg, version = package.split(compare)
             if pkg in EXCLUDE:
                 return
-
+            if pkg in REMAP_VERSION:
+                return "".join((pkg, compare, REMAP_VERSION[pkg]))
             if pkg in RENAME:
                 return "".join((RENAME[pkg], compare, version))