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C++ 日期格式化
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#include <chrono> | |
#include <ctime> | |
#include <iostream> | |
#include <string> | |
/** | |
* date format to string | |
* https://cplusplus.com/reference/ctime/strftime/ | |
*/ | |
std::string datetime_format(std::time_t time, const std::string& format, std::size_t sz = 20) { | |
std::string datetime(sz, '\0'); | |
std::strftime(&datetime[0], datetime.size(), format.data(), std::localtime(&time)); | |
return datetime; | |
} | |
std::string curr_format(const std::string& format, std::size_t sz = 20) { | |
typedef std::chrono::system_clock Clock; | |
return datetime_format(Clock::to_time_t(Clock::now()), format, sz); | |
} | |
int main() { | |
typedef std::chrono::system_clock Clock; | |
std::time_t now{Clock::to_time_t(Clock::now())}; | |
std::cout << curr_format("现在是 %F %T", 50).c_str() << '\n'; | |
std::cout << datetime_format(now, "现在是 %F").c_str() << '\n'; | |
std::cout << datetime_format(now, "现在是 %T").c_str() << '\n'; | |
return 0; | |
} |
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