logging: extract time format

src/common/log.c

@@ -223,8 +223,7 @@ static int _log_msg(logsrc_t src, int level, const char *msg)
 		precise = true;
 #endif /* ENABLE_MICROSECONDS_LOG */
 
-		tlen = strftime(tstr, sizeof(tstr),
-				"%Y-%m-%dT%H:%M:%S ", &lt);
+		tlen = strftime(tstr, sizeof(tstr), KNOT_LOG_TIME_FORMAT " ", &lt);
 
 		if (precise && tlen > 0) {
 			char pm = (lt.tm_gmtoff > 0) ? '+' : '-';

src/common/log.h

@@ -62,6 +62,9 @@ typedef enum {
 /*! \brief Severity mapping. */
 #define LOG_FATAL LOG_CRIT /*!< Fatal errors cannot be masked. */
 
+/*! \brief Format for timestamps in log files. */
+#define KNOT_LOG_TIME_FORMAT "%Y-%m-%dT%H:%M:%S"
+
 /* Logging facility setup. */
 
 /*!