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Date and time

Example Topic
Time <ctime> timestamps and strftime, <chrono> calendar dates

See also core/concurrency/Timing for measuring elapsed time with <chrono>.

Date and Time

  • <ctime>: provides functions and types to work with date and time values including parsing and formatting (inherited from C)

  • <chrono>: provides facilities to deal with the duration time points and clocks (std11), it is more modern and type-safe approach

ctime

  • Data Types:
    • time_t: for timestamps
    • struct tm: for datetime structes
    • Use mktime() to convert struct tm to time_t, and localtime() and gmtime() for vice versa
  • strftime() format:

%a Short representation of the weekday Fri %b Short representation of the month name Dec %B Full representation of the month name December %d Day of the month with leading zero 09 %e Day of the month with leading spaces 9 %H 24-hour format of an hour 14 %I 12-hour format of an hour 02 %M Minutes within an hour 30 %p AM or PM PM %S Seconds within a minute 01 %y 2-digit year representation 23 %Y 4-digit year representation 2023