Improve time and date support (don't cast to datetime) and support all recurrence types and time periods in work schedules

src/ifcopenshell-python/ifcopenshell/util/date.py

@@ -1,5 +1,5 @@
+import datetime
 from re import findall
-from datetime import datetime
 
 
 def duration2dict(duration):
@@ -12,12 +12,16 @@ def duration2dict(duration):
 def ifc2datetime(element):
     if isinstance(element, str) and element[0] == "P":  # IfcDuration
         return duration2dict(element)
-    elif isinstance(element, str):  # IfcDateTime, IfcDate
-        return datetime.fromisoformat(element)
+    elif isinstance(element, str) and element[2] == ":":  # IfcTime
+        return datetime.time.fromisoformat(element)
+    elif isinstance(element, str) and ":" in element:  # IfcDateTime
+        return datetime.datetime.fromisoformat(element)
+    elif isinstance(element, str):  # IfcDate
+        return datetime.date.fromisoformat(element)
     elif isinstance(element, int):  # IfcTimeStamp
-        return datetime.fromtimestamp(element)
+        return datetime.datetime.fromtimestamp(element)
     elif element.is_a("IfcDateAndTime"):
-        return datetime(
+        return datetime.datetime(
             element.DateComponent.YearComponent,
             element.DateComponent.MonthComponent,
             element.DateComponent.DayComponent,
@@ -27,7 +31,7 @@ def ifc2datetime(element):
             # TODO: implement TimeComponent timezone
         )
     elif element.is_a("IfcCalendarDate"):
-        return datetime(
+        return datetime.date(
             element.YearComponent,
             element.MonthComponent,
             element.DayComponent,
@@ -36,15 +40,24 @@ def ifc2datetime(element):
 
 def datetime2ifc(dt, ifc_type):
     if isinstance(dt, str):
-        dt = datetime.fromisoformat(dt)
+        dt = datetime.datetime.fromisoformat(dt)
     if ifc_type == "IfcTimeStamp":
         return int(dt.timestamp())
     elif ifc_type == "IfcDateTime":
-        return dt.isoformat()
+        if isinstance(dt, datetime.datetime):
+            return dt.isoformat()
+        elif isinstance(dt, datetime.date):
+            return datetime.datetime.combine(dt, datetime.datetime.min.time()).isoformat()
     elif ifc_type == "IfcDate":
-        return dt.date().isoformat()
+        if isinstance(dt, datetime.datetime):
+            return dt.date().isoformat()
+        elif isinstance(dt, datetime.date):
+            return dt.isoformat()
     elif ifc_type == "IfcTime":
-        return dt.time().isoformat()
+        if isinstance(dt, datetime.datetime):
+            return dt.time().isoformat()
+        elif isinstance(dt, datetime.time):
+            return dt.isoformat()
     elif ifc_type == "IfcCalendarDate":
         return {"DayComponent": dt.day, "MonthComponent": dt.month, "YearComponent": dt.year}
     elif ifc_type == "IfcLocalTime":