localtime_r()
Convert calendar time to local time
Synopsis:
#include <time.h>
struct tm* localtime_r( const time_t* timer,
struct tm* result );
Arguments:
- timer
- A pointer to a time_t object that contains the calendar time that you want to convert.
- result
- A pointer to a tm structure where the function can store the converted time.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The localtime_r() function converts the calendar time pointed to by timer into local time, storing the information in the struct tm that result points to. Whenever you call localtime_r(), it calls tzset().
You typically get a calendar time by calling time(). That time is Coordinated Universal Time (UTC, formerly known as Greenwich Mean Time or GMT).
You typically use the
date
command to set the computer's internal clock using Coordinated Universal Time (UTC).
Use the TZ environment variable or _CS_TIMEZONE
configuration string to establish the local time zone.
For more information, see
Setting the time zone
in the Configuring Your Environment chapter of the
QNX OS User's Guide.
Returns:
On success, a pointer to the static tm structure containing the time information. On failure, NULL (errno is set).
Errors:
- EOVERFLOW
- The requested time value can't be represented.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |