getdate_r - Linux
Overview
getdate_r fetches the current date and time and converts it to a broken-down time structure. It is typically used to obtain system time information for applications that require precise timestamp handling or time-based operations.
Syntax
int getdate_r(struct tm *tm);
Options/Flags
None.
Examples
Get the current date and time:
struct tm tm;
getdate_r(&tm);
printf("Current date and time: %s\n", asctime(&tm));
Convert a specific timestamp to a broken-down time structure:
time_t timestamp = 1577836800;
struct tm *tm;
tm = gmtime_r(×tamp, tm);
printf("Date for timestamp (GMT): %s\n", asctime(tm));
Common Issues
- Incorrect time zone: If the system time zone is not correctly set, the retrieved timestamp may be inaccurate.
- Insufficient memory: If the provided
tm
structure does not have enough allocated memory, the function may fail.
Integration
getdate_r can be integrated with other time-related commands and routines, such as:
- time: Get the current time in seconds since the Epoch.
- gmtime_r: Convert a time value to Coordinated Universal Time (UTC).
- strftime: Format a
tm
structure into a custom string representation.
Related Commands
- date: Print the current date and time.
- cal: Display a monthly calendar.
- timedatectl: Manage system time settings.