Changeset 848 for trunk/python/liblas/header.py

Timestamp:

08/19/08 00:07:21 (5 months ago)

Author:

hobu

Message:

handle leap year correctly #71

Files:

• trunk/python/liblas/header.py (modified) (3 diffs)

trunk/python/liblas/header.py

@@ -46 +46 @@
 import vlr
 
+def leap_year(year):
+    if (year % 400) == 0:
+        return True
+    elif (year % 100) == 0:
+        return True
+    elif (year % 4) == 0:
+        return True
+    return False
+    
 class Header(object):
     def __init__(self, owned=True, handle=None):
@@ -139 +148 @@
         day = core.las.LASHeader_GetCreationDOY(self.handle)
         year = core.las.LASHeader_GetCreationYear(self.handle)
-        
         if year == 0 and day == 0:
             return None
-        
-        return datetime.datetime(year,1,1)+datetime.timedelta(day)
+        if not leap_year(year):
+            return datetime.datetime(year,1,1)+datetime.timedelta(day)
+        else:
+            return datetime.datetime(year,1,1)+datetime.timedelta(day-1)
     def set_date(self, value=datetime.datetime.now()):
         """Set the header's date from a datetime.datetime instance.
@@ -159 +169 @@
         """
         delta = value - datetime.datetime(value.year,1,1)
-        core.las.LASHeader_SetCreationDOY(self.handle, delta.days)
+        if not leap_year(value.year):
+            core.las.LASHeader_SetCreationDOY(self.handle, delta.days)
+        else:
+            core.las.LASHeader_SetCreationDOY(self.handle, delta.days + 1)
         core.las.LASHeader_SetCreationYear(self.handle, value.year)
     date = property(get_date, set_date)