ceph/src/boost/libs/date_time/test/posix_time/testc_local_adjustor.cpp

   1 /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
   2  * Use, modification and distribution is subject to the
   3  * Boost Software License, Version 1.0. (See accompanying
   4  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   5  * Author: Jeff Garland
   6  */
   7
   8 #include "boost/date_time/posix_time/posix_time.hpp"
   9 #include "boost/date_time/c_local_time_adjustor.hpp"
  10 #include "../testfrmwk.hpp"
  11
  12 int
  13 main()
  14 {
  15   using namespace boost::posix_time;
  16   using namespace boost::gregorian;
  17
  18   //These are a compile check / test.  They have to be hand inspected
  19   //b/c they depend on the TZ settings of the machine and hence it is
  20   //unclear what the results will be
  21   typedef boost::date_time::c_local_adjustor<ptime> local_adj;
  22
  23   ptime t1(date(2002,Jan,1), hours(7)+millisec(5));
  24   std::cout << "UTC <--> TZ Setting of Machine -- No DST" << std::endl;
  25   ptime t2 = local_adj::utc_to_local(t1);
  26   std::cout << to_simple_string(t2) << " LOCAL is "
  27             << to_simple_string(t1) << " UTC time "
  28             << std::endl;
  29   time_duration td1 = t2 - t1;
  30   std::cout << "A difference of: " << to_simple_string(td1)
  31             << std::endl;
  32
  33
  34   ptime t3(date(2002,May,1), hours(5)+millisec(5));
  35   std::cout << "UTC <--> TZ Setting of Machine -- In DST" << std::endl;
  36   ptime t4 = local_adj::utc_to_local(t3);
  37   std::cout << to_simple_string(t4) << " LOCAL is "
  38             << to_simple_string(t3) << " UTC time "
  39             << std::endl;
  40   time_duration td2 = t4 - t3;
  41   std::cout << "A difference of: " << to_simple_string(td2)
  42             << std::endl;
  43
  44   ptime t5(date(2040,May,1), hours(5)+millisec(5));
  45   std::cout << "UTC <--> TZ Setting of Machine -- In DST" << std::endl;
  46   ptime t6 = local_adj::utc_to_local(t5);
  47   std::cout << to_simple_string(t6) << " LOCAL is "
  48             << to_simple_string(t5) << " UTC time "
  49             << std::endl;
  50   time_duration td3 = t6 - t5;
  51   std::cout << "a difference of: " << to_simple_string(td3)
  52             << std::endl;
  53
  54   // The following tests are unaware of the local time zone, but they
  55   // should help spot some errors. Manual inspection could still be
  56   // required.
  57
  58   // Based on http://stackoverflow.com/questions/8131023
  59   // All time zones are between -12 and +14
  60   check("td1 isn't too low", td1 >= hours(-12));
  61   check("td1 isn't too high", td1 <= hours(14));
  62   check("td2 isn't too low", td2 >= hours(-12));
  63   check("td2 isn't too high", td2 <= hours(14));
  64   check("td3 isn't too low", td3 >= hours(-12));
  65   check("td3 isn't too high", td3 <= hours(14));
  66
  67   // Assuming that no one uses DST of more than an hour.
  68   check("td1 and td2 are close",
  69           td1 - td2 <= hours(1) && td2 - td1 <= hours(1));
  70   check("td2 and td3 are close",
  71           td2 - td3 <= hours(2) && td3 - td2 <= hours(2));
  72   check("td1 and td3 are close",
  73           td1 - td3 <= hours(1) && td3 - td1 <= hours(1));
  74
  75   return printTestStats();
  76 }
  77