1 files changed, 90 insertions, 0 deletions
diff --git a/src/boost/libs/date_time/example/posix_time/local_utc_conversion.cpp b/src/boost/libs/date_time/example/posix_time/local_utc_conversion.cpp
new file mode 100644
index 000000000..5e712e88e
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+++ b/src/boost/libs/date_time/example/posix_time/local_utc_conversion.cpp
@@ -0,0 +1,90 @@
+/* Demonstrate conversions between a local time and utc
+ * Output:
+ * 
+ * UTC <--> New York while DST is NOT active (5 hours)
+ * 2001-Dec-31 19:00:00 in New York is 2002-Jan-01 00:00:00 UTC time 
+ * 2002-Jan-01 00:00:00 UTC is 2001-Dec-31 19:00:00 New York time 
+ * 
+ * UTC <--> New York while DST is active (4 hours)
+ * 2002-May-31 20:00:00 in New York is 2002-Jun-01 00:00:00 UTC time 
+ * 2002-Jun-01 00:00:00 UTC is 2002-May-31 20:00:00 New York time 
+ * 
+ * UTC <--> Arizona (7 hours)
+ * 2002-May-31 17:00:00 in Arizona is 2002-Jun-01 00:00:00 UTC time 
+ */
+
+#include "boost/date_time/posix_time/posix_time.hpp"
+#include "boost/date_time/local_time_adjustor.hpp"
+#include "boost/date_time/c_local_time_adjustor.hpp"
+#include <iostream>
+
+int
+main() 
+{
+  using namespace boost::posix_time;
+  using namespace boost::gregorian;
+
+  //This local adjustor depends on the machine TZ settings-- highly dangerous!
+  typedef boost::date_time::c_local_adjustor<ptime> local_adj;
+  ptime t10(date(2002,Jan,1), hours(7)); 
+  ptime t11 = local_adj::utc_to_local(t10);
+  std::cout << "UTC <--> Zone base on TZ setting" << std::endl;
+  std::cout << to_simple_string(t11) << " in your TZ is " 
+            << to_simple_string(t10) << " UTC time "
+            << std::endl;
+  time_duration td = t11 - t10;
+  std::cout << "A difference of: " 
+            << to_simple_string(td) << std::endl;
+
+
+  //eastern timezone is utc-5
+  typedef boost::date_time::local_adjustor<ptime, -5, us_dst> us_eastern;
+
+  ptime t1(date(2001,Dec,31), hours(19)); //5 hours b/f midnight NY time
+
+  std::cout << "\nUTC <--> New York while DST is NOT active (5 hours)" 
+            << std::endl;
+  ptime t2 =  us_eastern::local_to_utc(t1);
+  std::cout << to_simple_string(t1) << " in New York is " 
+            << to_simple_string(t2) << " UTC time "
+            << std::endl;
+
+  ptime t3 = us_eastern::utc_to_local(t2);//back should be the same
+  std::cout << to_simple_string(t2) << " UTC is " 
+            << to_simple_string(t3) << " New York time "
+            << "\n\n";
+
+  ptime t4(date(2002,May,31), hours(20)); //4 hours b/f midnight NY time
+  std::cout << "UTC <--> New York while DST is active (4 hours)" << std::endl;
+  ptime t5 = us_eastern::local_to_utc(t4);
+  std::cout << to_simple_string(t4) << " in New York is " 
+            << to_simple_string(t5) << " UTC time "
+            << std::endl;
+
+  ptime t6 = us_eastern::utc_to_local(t5);//back should be the same
+  std::cout << to_simple_string(t5) << " UTC is " 
+            << to_simple_string(t6) << " New York time "
+            << "\n" << std::endl;
+
+    
+  //Arizona timezone is utc-7 with no dst
+  typedef boost::date_time::local_adjustor<ptime, -7, no_dst> us_arizona;
+
+  ptime t7(date(2002,May,31), hours(17)); 
+  std::cout << "UTC <--> Arizona (7 hours)" << std::endl;
+  ptime t8 = us_arizona::local_to_utc(t7);
+  std::cout << to_simple_string(t7) << " in Arizona is " 
+            << to_simple_string(t8) << " UTC time "
+            << std::endl;
+
+  return 0;
+}
+
+
+/*  Copyright 2001-2004: CrystalClear Software, Inc
+ *  http://www.crystalclearsoftware.com
+ *
+ *  Subject to the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+