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Time Conversion Time library in C language provides a number of functions related to time. The time library defines also a number of time related data types. In these functions, time_t is the time-type which represents the time value internally by the system. For historical reasons, time_t is generally implemented as an integer, representing the number of seconds elapsed since 00:00:00, Jan 1, 1970 UTC (i.e., in Coordinated Universal Time, also known as Greenwich Mean Time (GMT), a global timestamp). Although libraries may implement this type using alternative time representations, our codeSubmit system also implements it as an integer. The associated input/ output format specifier is %ld. In order to provide human readable format for both time and date, another data type struct tm is used. Below is the description for struct tm defined in the C time library, note the range of values of the members. The struct tm structure has the following definition - struct tm { int tm_sec; /* seconds, range 0 to 59 int tm_min; /* minutes, range o to 59 int tm_hour; /* hours, range 0 to 23 * * * * * int tm_mday; /* day of the month, range 1 to 31 */ int tm_mon; /* month, range 0 to 11 int tm_year; /* The number of years since 1900 */ int tm_wday; /* day of the week, range 0 to 6 */ int tm_yday; /* day in the year, range o to 365 */ int tm_isdst; /* daylight saving time */ }; To convert between time_t and struct tm, localtime () function is provided. struct tm *localtime (const time_t *timer) The value pointed by the input pointer parameter timer in the function call is analyzed in the local time zone and broken up into different human understandable date-and-time components. The results are stored into different members of a data structure of type sturot tm and returned as a pointer to such a structure