6664 			return this.date_part(this.add(date, -1 * shift, "day"));
6719 		add: function (date, inc, mode) {
6760 			return this.add(date, inc * 3, "month");
7652 				var add = "";
7656 					add = " " + (allowed ? "gantt_link_allow" : "gantt_link_deny");
7659 				return "gantt_link_tooltip" + add;
8066 			upper = gantt.date.add(lower, steps, unit);
8076 				upper = gantt.date[unit + "_start"](gantt.date.add(upper, steps, unit));
8085 			lower = gantt.date.add(upper, -1 * steps, unit);
9351                 add: gantt.addTask,  property in dp.insertCallback.methods
9355                 methods.add = gantt.addLink;
9362             methods.add.call(gantt, data);
12336 				date = gantt.date.add(date, offsetChanged, "minute");
12399 			end = gantt.date.add(start_interval, 1, unit);
13247 				return gantt.date.add(startDate, gantt._get_timepicker_step(), "minute");
15926 				currDate = gantt.date.add(currDate, scaleStep, scaleUnit);
15947 			end = gantt.date.add(start, scaleStep, scaleUnit);
16130 				var colEnd = scale.trace_x[i + 1] || gantt.date.add(colStart, scale.step, scale.unit);
18166 			add: linksToAdd,
18189 			if (linksDiff.add.length || linksDiff.remove.length) {
18191 					linksDiff.add.forEach(function (link) {
25236 				return dateHelper.add(d, step, unit) - d;
25385 						probe = dateHelper.add(date, i, scale.unit);
25427 …var days = Math.round((dateHelper.add(config.trace_x[i], config.step, config.unit) - config.trace_…
25501 				end = dateHelper.add(curr, step, unit);
25506 				curr = dateHelper.add(curr, step, unit);
25527 			var outDate = dateHelper.add(lastDate, cfg.step, cfg.unit);
26850 		return this.$gantt.date.add(date, scale.step, scale.unit) - date;
27614 			start = this.$gantt.date.add(start, 1, "hour");
27631 			start = this.$gantt.date.add(start, 1, "day");
27904 		return dateHelper.add(start, step, unit);
27953 					stepEnd = dateHelper.add(stepStart, step, unit);
28015 		var firstDayEnd = this.$gantt.date.add(this.$gantt.date.day_start(new Date(start)), 1, "day");
28364 		return this.$gantt.date.add(result, 1, unit);
28399 			result = this.$gantt.date.add(result, increment, unit);
28470 				from = dateHelper.add(from, step, unit);
28474 				res += (to - from) / (dateHelper.add(from, step, unit) - from);
28504 		return this.$gantt.date.add(start, step * duration, unit);