Add the date util

packages/api/src/utils/dateUtils.ts

@@ -0,0 +1,53 @@
+const maxDuration = 30 * 24 * 60 * 60 * 1000 // 30 days
+const defaultDuration = 7 * 24 * 60 * 60 * 1000 // 7 days
+
+/**
+ * Validates that the given time range doesn't exceed the max allowed duration.
+ *
+ * @param startAt
+ * @param endAt
+ * @returns
+ */
+export const validateDateRange = (startAt: string, endAt: string) => {
+	const start = new Date(startAt)
+	const end = new Date(endAt || new Date())
+	const durationMs = end.getTime() - start.getTime()
+	return durationMs <= maxDuration
+}
+
+/**
+ * Utility to get default dates if not provided.
+ * Default to last 7 days
+ *
+ * @param startAt
+ * @param endAt
+ * @returns
+ */
+export const getValidatedDates = (startAt?: string, endAt?: string) => {
+	const now = new Date()
+
+	if (!startAt && !endAt) {
+		return {
+			startAt: new Date(now.getTime() - defaultDuration).toISOString(),
+			endAt: null
+		}
+	}
+
+	if (startAt && !endAt) {
+		const start = new Date(startAt)
+		return {
+			startAt,
+			endAt: new Date(Math.min(start.getTime() + defaultDuration, now.getTime())).toISOString()
+		}
+	}
+
+	if (!startAt && endAt) {
+		const end = new Date(endAt)
+		return {
+			startAt: new Date(end.getTime() - defaultDuration).toISOString(),
+			endAt
+		}
+	}
+
+	return { startAt, endAt }
+}