1 files changed, 65 insertions, 0 deletions
diff --git a/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp b/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp
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index 000000000..decaf33bb
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+++ b/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp
@@ -0,0 +1,65 @@
+/* This example demonstrates the use of the time zone database and 
+ * local time to calculate the number of seconds since the UTC
+ * time_t epoch 1970-01-01 00:00:00.  Note that the selected timezone
+ * could be any timezone supported in the time zone database file which
+ * can be modified and updated as needed by the user.
+ *
+ * To solve this problem the following steps are required:
+ * 1) Get a timezone from the tz database for the local time
+ * 2) Construct a local time using the timezone
+ * 3) Construct a posix_time::ptime for the time_t epoch time
+ * 4) Convert the local_time to utc and subtract the epoch time
+ * 
+ */
+
+#include "boost/date_time/local_time/local_time.hpp"
+#include <iostream>
+
+int main()
+{
+  using namespace boost::gregorian; 
+  using namespace boost::local_time;
+  using namespace boost::posix_time;
+  
+  tz_database tz_db;
+  try {
+    tz_db.load_from_file("../data/date_time_zonespec.csv");
+  }catch(const data_not_accessible& dna) {
+    std::cerr << "Error with time zone data file: " << dna.what() << std::endl;
+    exit(EXIT_FAILURE);
+  }catch(const bad_field_count& bfc) {
+    std::cerr << "Error with time zone data file: " << bfc.what() << std::endl;
+    exit(EXIT_FAILURE);
+  }
+
+  time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York");
+  date in_date(2004,10,04);
+  time_duration td(12,14,32);
+  // construct with local time value
+  // create not-a-date-time if invalid (eg: in dst transition)
+  local_date_time nyc_time(in_date, 
+                           td, 
+                           nyc_tz, 
+                           local_date_time::NOT_DATE_TIME_ON_ERROR);
+
+  std::cout << nyc_time << std::endl;
+
+  ptime time_t_epoch(date(1970,1,1)); 
+  std::cout << time_t_epoch << std::endl;
+
+  // first convert nyc_time to utc via the utc_time() 
+  // call and subtract the ptime.
+  time_duration diff = nyc_time.utc_time() - time_t_epoch;
+
+  //Expected 1096906472
+  std::cout << "Seconds diff: " << diff.total_seconds() << std::endl;
+
+}
+
+
+/*  Copyright 2005: 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)
+ */