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  1. #include <ctime>
  2. #include <chrono>
  3. #include <iostream>
  4.  
  5. using namespace std;
  6. using namespace std::chrono;
  7.  
  8. int main()
  9. {
  10.    char time_zone[] = "TZ=CET-1CEST";
  11.    putenv( time_zone );
  12.    tzset();
  13.  
  14.    struct tm tm_gm; // 59, 29, 16, 12, 2, 119, 2, 70, 1 => 16:29:59 12.03.2019 (ok)
  15.    struct tm tm_lc; // 59, 29, 17, 12, 2, 119, 2, 70, 1 => 17:29:59 12.03.2019 (ok)
  16.  
  17.    time_t time_now   = time( nullptr );                                // 1552404599
  18.    time_t time_lc    = mktime( localtime_r( &time_now, &tm_lc ) );     // 1552404599
  19.    time_t time_gm    = mktime( gmtime_r( &time_now, &tm_gm ) );        // 1552400999
  20.    time_t chrono_utc = system_clock::to_time_t( system_clock::now() ); // 1552408199
  21.  
  22.    int diff_lc_chrono = time_lc - chrono_utc; // -3600
  23.    int diff_lc_gm     = time_lc - time_gm;    // 3600
  24.    int diff_chrono_lc = chrono_utc - time_lc; // 3600
  25.    int diff_chrono_gm = chrono_utc - time_gm; // 7200 ???
  26.  
  27.    cout << "diff_lc_chrono: "	<< diff_lc_chrono << "\n"
  28. 		<< "diff_lc_gm    : "	<< diff_lc_gm << "\n"   
  29. 		<< "diff_chrono_lc: "	<< diff_chrono_lc << "\n"   
  30. 		<< "diff_chrono_gm: "	<< diff_chrono_gm;
  31.  
  32.  
  33. }
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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diff_lc_chrono: 0
diff_lc_gm    : 3600
diff_chrono_lc: 0
diff_chrono_gm: 3600
https://ideone.com/jiIKGv
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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