2 files changed, 45 insertions, 0 deletions
diff --git a/ppad/lib/__init__.py b/ppad/lib/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/ppad/lib/__init__.py
diff --git a/ppad/lib/util.py b/ppad/lib/util.py
new file mode 100644
index 0000000..0a97141
--- /dev/null
+++ b/ppad/lib/util.py
@@ -0,0 +1,45 @@
+import datetime
+from dateutil import parser
+import pytz
+import time
+
+
+def parse_date(date: str) -> datetime:
+    dt = parser.isoparse(date)
+
+    if dt.tzinfo is not None:
+        return dt
+
+    default_tz = pytz.timezone(time.tzname[time.daylight])
+    return default_tz.localize(dt)
+
+
+def parse_argv(argv: list[str]) -> tuple[datetime, datetime]:
+    if len(argv) == 1:
+        return None, None
+
+    date_to: datetime = None
+    date_from: datetime = None
+    from_str: str
+    to_str: str
+
+    span = argv[1].split('~')
+    if len(span) == 1:
+        from_str = to_str = span[0]
+    else:
+        [from_str, to_str, *_] = span
+
+    if from_str:
+        date_from = parse_date(from_str)
+
+    if to_str:
+        date_to = parse_date(to_str)
+
+    if date_from is None and date_to is None:
+        # probably `argv` would be only character '~'
+        return None, None
+
+    if date_from == date_to:
+        date_to = date_to + datetime.timedelta(days=1)
+
+    return date_from, date_to