diff --git a/inc/inc.Utils.php b/inc/inc.Utils.php
index 8c4534a1e..87b48a2c8 100644
--- a/inc/inc.Utils.php
+++ b/inc/inc.Utils.php
@@ -166,6 +166,79 @@ function getReadableDurationArray($secs) { /* {{{ */
 	return $units;
 } /* }}} */
 
+/**
+ * Return the timestamp after a period of time
+ *
+ * The period is relative to $start. $r sets if the returned
+ * time stamp is the start, end or current seconds of day.
+ * getTsByPeriod('today', 's') returns 00:00:00 of today
+ * getTsByPeriod('tomorrow', 'e') returns 23:59:59 of tommorrow
+ * The parameter $start can be any timestamp from where the
+ * period starts
+ * getTsByPeriod('today', 's', time()+7*86400) is equivalent to
+ * getTsByPeriod('1w', 's')
+ */
+function getTsByPeriod($period, $r='', $start=0) { /* {{{ */
+	if(!$start)
+		$start = time();
+	$sofd = time() - strtotime('today'); // seconds elapsed today
+	switch($r) {
+	case 's': // start of day
+		$o = $sofd;
+		break;
+	case 'e': // end of day
+		$o = $sofd-86400+1;
+		break;
+	default: // same sec as current time
+		$o = 0;
+	}
+	switch($period) {
+	case "never":
+		$expiration = 0;
+		break;
+	case "1h":
+		$expiration = $start+3600;
+		break;
+	case "2h":
+		$expiration = $start+7200;
+		break;
+	case "24h":
+		$expiration = $start+86400;
+		break;
+	case "today":
+		$expiration = $start - $o;
+		break;
+	case "1d":
+		$expiration = $start-$o+86400;
+		break;
+	case "tomorrow":
+		$expiration = $start - $o + 86400;
+		break;
+	case "1w":
+		$expiration = $start-$o+7*86400;
+		break;
+	case "1m":
+		$tmp = explode('-', date('Y-m-d', $start));
+		$expiration = mktime(0,0,0, $tmp[1]+1, $tmp[2], $tmp[0])+$sofd-$o;
+		break;
+	case "1y":
+		$tmp = explode('-', date('Y-m-d', $start));
+		$expiration = mktime(0,0,0, $tmp[1], $tmp[2], $tmp[0]+1)+$sofd-$o;
+		break;
+	case "2y":
+		$tmp = explode('-', date('Y-m-d', $start));
+		$expiration = mktime(0,0,0, $tmp[1], $tmp[2], $tmp[0]+2)+$sofd-$o;
+		break;
+	case "3y":
+		$tmp = explode('-', date('Y-m-d', $start));
+		$expiration = mktime(0,0,0, $tmp[1], $tmp[2], $tmp[0]+3)+$sofd-$o;
+		break;
+	default:
+		$expiration = false;
+	}
+	return $expiration;
+} /* }}} */
+
 /* Deprecated, do not use anymore, but keep it for upgrading
  * older versions
  */