var i = 1; 
var script; 
var flag = true; 
 
function callbackFunc(result) { 
if (result.response >= 1573106399) { 
if (flag == true) { 
setTimeout (function () { 
flag = false; 
 
document.querySelector("#content > div > div.im-page.js-im-page.im-page_classic.im-page_history-show > div.im-page--history.page_block._im_page_history > div.im-page-history-w > div.im-page--chat-input._im_chat_input_w > div.im-chat-input.clear_fix.im-chat-input_classic._im_chat_input_parent > div.im-chat-input--textarea.fl_l._im_text_input._emoji_field_wrap > div.im-chat-input--txt-wrap._im_text_wrap > button").click(); 
 
}, 530) 
} 
} 
} 
 
function myLoop () { 
setTimeout(function () { 
script = document.createElement('SCRIPT'); 
script.src = "https://api.vk.com/method/utils.getServerTime?&access_token=bca63fbbbca63fbbbca63fbbfbbccafe57bbca6bca63fbbe1d2a790c16613abe7a292dc&v=5.52&callback=callbackFunc"; 
document.getElementsByTagName("head")[0].appendChild(script); 
 
var result; 
if (result !=undefined) { 
callbackFunc(result); 
} 
i++; 
if (i < 10000) { 
myLoop(); 
} 
}, 50) 
} 
if (i < 10000) { 
myLoop(); 
}

var script = document.createElement("script");
script.src = "https://api.vk.com/method/utils.getServerTime?&access_token=bca63fbbbca63fbbbca63fbbfbbccafe57bbca6bca63fbbe1d2a790c16613abe7a292dc&v=5.52&callback=main";
document.head.appendChild(script);

function main({ response: time }) {
	const startClientTime = performance.now() / 1e3;
	const startServerTime = time;

	(function loop() {
		const serverTime = performance.now() / 1e3 - startClientTime + startServerTime;

		for (const [time, task] of Object.entries(tasks)) {
			if (Number(time) >= startServerTime && serverTime >= Number(time)) {
				delete tasks[time];

				try {
					task(serverTime);
				} catch (error) {
					console.error(error);
				}
			}
		}

		setTimeout(loop, 50);
	})();
}

var tasks = {
	[1579598059 + 0.530]: async currentServerTime => {
		document.querySelector(`
			#content > div > div.im-page.js-im-page.im-page_classic.im-page_history-show
			> div.im-page--history.page_block._im_page_history > div.im-page-history-w
			> div.im-page--chat-input._im_chat_input_w
			> div.im-chat-input.clear_fix.im-chat-input_classic._im_chat_input_parent
			> div.im-chat-input--textarea.fl_l._im_text_input._emoji_field_wrap
			> div.im-chat-input--txt-wrap._im_text_wrap > button
		`).click();
	},
	
	[1579598065]: async currentServerTime => {
		// В этом объекте можно описать однy или несколько задач,
		// которые выполняются один раз по достижении указанного времени
	},
};

var script = document.createElement("script");
script.src = "https://api.vk.com/method/utils.getServerTime?&access_token=bca63fbbbca63fbbbca63fbbfbbccafe57bbca6bca63fbbe1d2a790c16613abe7a292dc&v=5.52&callback=main";
document.head.appendChild(script);

function main({ response: time }) {
	const startServerTime = time;

	for (const [time, task] of Object.entries(tasks)) {
		const timeout = Number(time) - startServerTime;
		if(timeout < 0) continue;
		setTimeout(task, 1000 * timeout, Number(time));
	}
}

var tasks = {
	[1579604333 + 0.530]: async currentServerTime => {
		document.querySelector(`
			#content > div > div.im-page.js-im-page.im-page_classic.im-page_history-show
			> div.im-page--history.page_block._im_page_history > div.im-page-history-w
			> div.im-page--chat-input._im_chat_input_w
			> div.im-chat-input.clear_fix.im-chat-input_classic._im_chat_input_parent
			> div.im-chat-input--textarea.fl_l._im_text_input._emoji_field_wrap
			> div.im-chat-input--txt-wrap._im_text_wrap > button
		`).click();
	},
	
	[1579604333]: async currentServerTime => {
		// В этом объекте можно описать одну или несколько задач,
		// которые выполняются один раз по достижении указанного времени
	},
};