Add Julian Date calculator

juliandate

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+""" Calculate the Julian Date """
+# http://www.cs.utsa.edu/~cs1063/projects/Spring2011/Project1/jdn-explanation.html
+
+import time
+
+t = time.gmtime()
+
+a = (14 - t.tm_mon) / 12
+y = t.tm_year + 4800 - a
+m = t.tm_mon + 12 * a - 3
+
+jdn = t.tm_mday + (153 * m + 2) / 5 + 365 * y +\
+      y / 4 - y / 100 + y / 400 - 32045
+
+jd = jdn + (t.tm_hour - 12) / 24.0 + t.tm_min / 1440.0 + t.tm_sec / 86400
+
+print "%05.1f" % jd
+