Initial commit: Dabit Time Manager project

Python-based time management application with UDP discovery,
TCP protocol communication, time sync, and drift monitoring.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/time_format.py

@@ -0,0 +1,37 @@
+"""날짜시간 <-> 프로토콜 포맷 변환 유틸리티"""
+
+from datetime import datetime
+
+
+def datetime_to_protocol(dt: datetime) -> str:
+    """datetime을 프로토콜 포맷으로 변환.
+    포맷: YYMMDDdHHMMSS (13자)
+    d: 요일 (0=일, 1=월, 2=화, 3=수, 4=목, 5=금, 6=토)
+
+    예: 2026-02-09 23:02:29 (월) → '2602091230229'
+    """
+    yy = dt.strftime("%y")
+    mm = dt.strftime("%m")
+    dd = dt.strftime("%d")
+    dow = dt.isoweekday() % 7  # 7->0(일), 1->1(월), ..., 6->6(토)
+    hh = dt.strftime("%H")
+    mi = dt.strftime("%M")
+    ss = dt.strftime("%S")
+    return f"{yy}{mm}{dd}{dow}{hh}{mi}{ss}"
+
+
+def protocol_to_datetime(data: str) -> datetime:
+    """프로토콜 포맷 문자열을 datetime으로 변환.
+    입력: YYMMDDdHHMMSS (13자)
+
+    예: '2602091230229' → 2026-02-09 23:02:29
+    """
+    yy = int(data[0:2])
+    mm = int(data[2:4])
+    dd = int(data[4:6])
+    # data[6] = 요일 (무시)
+    hh = int(data[7:9])
+    mi = int(data[9:11])
+    ss = int(data[11:13])
+    year = 2000 + yy
+    return datetime(year, mm, dd, hh, mi, ss)