get-datetime.ts
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get-datetime.ts
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	import prettyMs from "pretty-ms";

	const dateFormatters = {
	"yyyy-mm-dd": (date: Date) => date.toISOString().split("T")[0],
	};
	const timeFormatters = {
	"hh:mm:ss": (parsed_time: string) => parsed_time.substring(0, 8),
	"hh:mm:ss.mmm": (parsed_time: string) => parsed_time.slice(0, -1),
	};
	const dateFormats = Object.keys(dateFormatters);
	const timeFormats = Object.keys(timeFormatters);

	export function getTimeOfNow() {
	return getDateTime(new Date(), "hh:mm:ss.mmm");
	}

	export function getTimeDifference(begin: number, end: number) {
	const date = new Date();
	const currentTime = `${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}.${date.getMilliseconds()}`;
	const difference = `${prettyMs(end - begin)}`;
	return `${currentTime} (${difference})`;
	}

	export function getNow() {
	return getDateTime(new Date(), "yyyy-mm-dd hh:mm:ss.mmm");
	}

	export function getDateTime(date: Date, format_string = "yyyy-mm-dd hh:mm:ss") {
	const formats = format_string.split(" ");
	return formats
	.reduce((date_string, format) => {
	if (dateFormats.includes(format)) {
	return (
	date_string +
	" " +
	dateFormatters[format as keyof typeof dateFormatters](date)
	);
	} else if (timeFormats.includes(format)) {
	const parsed_time = date.toISOString().split("T")[1];
	return (
	date_string +
	" " +
	timeFormatters[format as keyof typeof timeFormatters](
	parsed_time
	)
	);
	} else {
	throw new Error("Unknown format: " + format);
	}
	}, "")
	.trimLeft();
	}