Parsing in <ctime>
The C++ <ctime> is inherited from C language and primarily uses the time_t data type to represent time.
1. Converting date-time string to time_t type.
It is a function to parse a date or time string.
Syntax:
time_t parseDateTime(const char* datetimeString, const char* format);
Here,
- time_t: It is an arithmetic type that is used to represent time in C++.
- parseDateTime: User-defined name of our function.
- dateTimeString: Parameter which represents the current date and time in human-readable form.
- format: The fashion in which dateTimeString is represented.
2. Converting time_t arithmetic type to string
Function to format a time_t value into a date or time string.
Syntax:
string formatDateTime(time_t time, const char* format)
Here,
- string: return type of
- time: It is time in time_t format.
- datetimeString: String representing date and time.
- format: format of the datetime string.
C++ Program:
C++
// C++ Program to implement Date and Time parsing using// <ctime>#include <ctime>#include <iostream>using namespace std;// function to parse a date or time string.time_t parseDateTime(const char* datetimeString, const char* format){ struct tm tmStruct; strptime(datetimeString, format, &tmStruct); return mktime(&tmStruct);}// Function to format a time_t value into a date or time string.string DateTime(time_t time, const char* format){ char buffer[90]; struct tm* timeinfo = localtime(&time); strftime(buffer, sizeof(buffer), format, timeinfo); return buffer;}int main(){ const char* datetimeString = "2023-06-17 12:36:51"; const char* format = "%Y-%m-%d %H:%M:%S"; time_t parsedTime = parseDateTime(datetimeString, format); string formattedTime = DateTime(parsedTime, format); cout << "Parsed Time--> " << parsedTime << endl; cout << "Formatted Time--> " << formattedTime << endl; return 0;} |
Output
Parsed Time--> 1687005411 Formatted Time--> 2023-06-17 12:36:51
Date and Time Parsing in C++
The Date and time parsing is a common task in programming especially when dealing with user input or data from external sources. C++ provides various utilities and libraries to handle date and time parsing efficiently. Some of the most commonly used libraries for date and time parsing in C++ are:
- <ctime>: This header provides functions and types to work with date and time values including parsing and formatting.
- <chrono>: This header provides facilities to deal with the duration time points and clocks. It is part of the C++11 standard and provides a more modern and type-safe approach to handling date and time operations.