rename: client -> frontend

packages/frontend/src/scripts/time.ts

@@ -0,0 +1,39 @@
+const dateTimeIntervals = {
+	'day': 86400000,
+	'hour': 3600000,
+	'ms': 1,
+};
+
+export function dateUTC(time: number[]): Date {
+	const d = time.length === 2 ? Date.UTC(time[0], time[1])
+					: time.length === 3 ? Date.UTC(time[0], time[1], time[2])
+					: time.length === 4 ? Date.UTC(time[0], time[1], time[2], time[3])
+					: time.length === 5 ? Date.UTC(time[0], time[1], time[2], time[3], time[4])
+					: time.length === 6 ? Date.UTC(time[0], time[1], time[2], time[3], time[4], time[5])
+					: time.length === 7 ? Date.UTC(time[0], time[1], time[2], time[3], time[4], time[5], time[6])
+					: null;
+
+	if (!d) throw 'wrong number of arguments';
+
+	return new Date(d);
+}
+
+export function isTimeSame(a: Date, b: Date): boolean {
+	return a.getTime() === b.getTime();
+}
+
+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 addTime(x: Date, value: number, span: keyof typeof dateTimeIntervals = 'ms'): Date {
+	return new Date(x.getTime() + (value * dateTimeIntervals[span]));
+}
+
+export function subtractTime(x: Date, value: number, span: keyof typeof dateTimeIntervals = 'ms'): Date {
+	return new Date(x.getTime() - (value * dateTimeIntervals[span]));
+}