diff -ur zabbix/include/defines.inc.php zabbix-patched/include/defines.inc.php
--- zabbix/include/defines.inc.php	2013-07-31 04:33:05.000000000 -0400
+++ zabbix-patched/include/defines.inc.php	2013-08-19 18:24:27.000000000 -0400
@@ -28,7 +28,7 @@
 define('ZBX_LOGIN_ATTEMPTS',	5);
 define('ZBX_LOGIN_BLOCK',		30); // sec
 
-define('ZBX_MIN_PERIOD',		3600); // 1 hour
+define('ZBX_MIN_PERIOD',		60); // 1 min
 define('ZBX_MAX_PERIOD',		63072000); // the maximum period for the time bar control, ~2 years (2 * 365 * 86400)
 define('ZBX_PERIOD_DEFAULT',	3600); // 1 hour
 
diff -ur zabbix/js/functions.js zabbix-patched/js/functions.js
--- zabbix/js/functions.js	2013-07-31 04:33:03.000000000 -0400
+++ zabbix-patched/js/functions.js	2013-08-19 18:27:06.000000000 -0400
@@ -887,7 +887,7 @@
 
 	var days = parseInt((timestamp - years * 31536000 - months * 2592000 - weeks * 604800) / 86400);
 	var hours = parseInt((timestamp - years * 31536000 - months * 2592000 - weeks * 604800 - days * 86400) / 3600);
-	//var minutes = parseInt((timestamp - years * 31536000 - months * 2592000 - weeks * 604800 - days * 86400 - hours * 3600) / 60);
+	var minutes = parseInt((timestamp - years * 31536000 - months * 2592000 - weeks * 604800 - days * 86400 - hours * 3600) / 60);
 
 	if (isTsDouble) {
 		if (months.toString().length == 1) {
@@ -902,9 +902,9 @@
 		if (hours.toString().length == 1) {
 			hours = '0' + hours;
 		}
-		/*if (minutes.toString().length == 1) {
+		if (minutes.toString().length == 1) {
 			minutes = '0' + minutes;
-		}*/
+		}
 	}
 
 	var str = (years == 0) ? '' : years + locale['S_YEAR_SHORT'] + ' ';
@@ -916,7 +916,7 @@
 			? ''
 			: days + locale['S_DAY_SHORT'] + ' ';
 	str += (hours == 0) ? '' : hours + locale['S_HOUR_SHORT'] + ' ';
-	//str += (minutes == 0) ? '' : minutes + locale['S_MINUTE_SHORT'] + ' ';
+	str += (minutes == 0) ? '' : minutes + locale['S_MINUTE_SHORT'] + ' ';
 
 	return str;
 }
diff -ur zabbix/js/gtlc.js zabbix-patched/js/gtlc.js
--- zabbix/js/gtlc.js	2013-07-31 04:33:03.000000000 -0400
+++ zabbix-patched/js/gtlc.js	2013-08-19 18:31:16.000000000 -0400
@@ -309,7 +309,7 @@
 	_period:	null,	// selected period
 	_now:		false,	// state if time is set to NOW
 	_isNow:		false,	// state if time is set to NOW (for outside usage)
-	minperiod:	3600,	// minimal allowed period
+	minperiod:	60,	// minimal allowed period
 	maxperiod:	null,	// max period in seconds
 
 	initialize: function($super, period, starttime, usertime, endtime, maximumPeriod, isNow) {
@@ -1124,7 +1124,7 @@
 	appendZoomLinks: function() {
 		var timeline = timeControl.timeline.endtime() - timeControl.timeline.starttime();
 		var caption = '';
-		var zooms = [3600, 7200, 10800, 21600, 43200, 86400, 604800, 1209600, 2592000, 7776000, 15552000, 31536000];
+		var zooms = [300, 900, 1800, 3600, 7200, 10800, 21600, 43200, 86400, 604800, 1209600, 2592000, 7776000, 15552000, 31536000];
 		var links = 0;
 
 		for (var key in zooms) {
@@ -1167,7 +1167,7 @@
 	appendNavLinks: function() {
 		var timeline = timeControl.timeline.endtime() - timeControl.timeline.starttime();
 		var caption = '';
-		var moves = [3600, 43200, 86400, 604800, 2592000, 15552000, 31536000];
+		var moves = [300, 900, 1800, 3600, 43200, 86400, 604800, 2592000, 15552000, 31536000];
 		var links = 0;
 
 		var tmp_laquo = document.createElement('span');
@@ -1693,6 +1693,7 @@
 
 			if (!is_null(this.dom_box)) {
 				this.dom_period_span.innerHTML = formatTimestamp(this.period, false, true) + (this.period < 3600 ? ' [min 1h]' : '');
+				this.dom_period_span.innerHTML = formatTimestamp(this.period, false, true) + (this.period < 60 ? ' [min 1' + locale['S_MINUTE_SHORT'] + ']' : '');
 			}
 		}
 	},