Bye moment from package.json (#5215)

* Bye moment from package.json

* Use Mapped types for argument type definition

src/prelude/time.ts

@@ -0,0 +1,31 @@
+const dateTimeIntervals = {
+	'days': 86400000,
+	'hours': 3600000,
+};
+
+export function DateUTC(time: number[]): Date {
+	const r = new Date(0);
+	r.setUTCFullYear(time[0], time[1], time[2]);
+	if (time[3]) r.setUTCHours(time[3], ...time.slice(4));
+	return r;
+}
+
+export function isTimeSame(a: Date, b: Date): boolean {
+	return (a.getTime() - b.getTime()) === 0;
+}
+
+export function isTimeBefore(a: Date, b: Date): boolean {
+	return (a.getTime() - b.getTime()) < 0;
+}
+
+export function isTimeAfter(a: Date, b: Date): boolean {
+	return (a.getTime() - b.getTime()) > 0;
+}
+
+export function addTimespan(x: Date, value: number, span: keyof typeof dateTimeIntervals): Date {
+	return new Date(x.getTime() + (value * dateTimeIntervals[span]));
+}
+
+export function subtractTimespan(x: Date, value: number, span: keyof typeof dateTimeIntervals): Date {
+	return new Date(x.getTime() - (value * dateTimeIntervals[span]));
+}