1 files changed, 42 insertions, 0 deletions
diff --git a/packages/shared/utils/relativeDateUtils.ts b/packages/shared/utils/relativeDateUtils.ts
new file mode 100644
index 00000000..437c3ea8
--- /dev/null
+++ b/packages/shared/utils/relativeDateUtils.ts
@@ -0,0 +1,42 @@
+interface RelativeDate {
+  direction: "newer" | "older";
+  amount: number;
+  unit: "day" | "week" | "month" | "year";
+}
+
+const parseRelativeDate = (date: string): RelativeDate => {
+  const match = date.match(/^([<>])(\d+)([dwmy])$/);
+  if (!match) {
+    throw new Error(`Invalid relative date format: ${date}`);
+  }
+  const direction = match[1] === "<" ? "newer" : "older";
+  const amount = parseInt(match[2], 10);
+  const unit = {
+    d: "day",
+    w: "week",
+    m: "month",
+    y: "year",
+  }[match[3]] as "day" | "week" | "month" | "year";
+  return { direction, amount, unit };
+};
+
+const toAbsoluteDate = (relativeDate: RelativeDate): Date => {
+  const date = new Date();
+  switch (relativeDate.unit) {
+    case "day":
+      date.setDate(date.getDate() - relativeDate.amount);
+      break;
+    case "week":
+      date.setDate(date.getDate() - relativeDate.amount * 7);
+      break;
+    case "month":
+      date.setMonth(date.getMonth() - relativeDate.amount);
+      break;
+    case "year":
+      date.setFullYear(date.getFullYear() - relativeDate.amount);
+      break;
+  }
+  return date;
+};
+
+export { parseRelativeDate, toAbsoluteDate };