1 files changed, 67 insertions, 0 deletions

diff --git a/shared/core-utils/common/date.ts b/shared/core-utils/common/date.ts
new file mode 100644
index 000000000..4f92f758f
--- /dev/null
+++ b/shared/core-utils/common/date.ts
@@ -0,0 +1,67 @@
+function isToday (d: Date) {
+  const today = new Date()
+
+  return areDatesEqual(d, today)
+}
+
+function isYesterday (d: Date) {
+  const yesterday = new Date()
+  yesterday.setDate(yesterday.getDate() - 1)
+
+  return areDatesEqual(d, yesterday)
+}
+
+function isThisWeek (d: Date) {
+  const minDateOfThisWeek = new Date()
+  minDateOfThisWeek.setHours(0, 0, 0)
+
+  // getDay() -> Sunday - Saturday : 0 - 6
+  // We want to start our week on Monday
+  let dayOfWeek = minDateOfThisWeek.getDay() - 1
+  if (dayOfWeek < 0) dayOfWeek = 6 // Sunday
+
+  minDateOfThisWeek.setDate(minDateOfThisWeek.getDate() - dayOfWeek)
+
+  return d >= minDateOfThisWeek
+}
+
+function isThisMonth (d: Date) {
+  const thisMonth = new Date().getMonth()
+
+  return d.getMonth() === thisMonth
+}
+
+function isLastMonth (d: Date) {
+  const now = new Date()
+
+  return getDaysDifferences(now, d) <= 30
+}
+
+function isLastWeek (d: Date) {
+  const now = new Date()
+
+  return getDaysDifferences(now, d) <= 7
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  isYesterday,
+  isThisWeek,
+  isThisMonth,
+  isToday,
+  isLastMonth,
+  isLastWeek
+}
+
+// ---------------------------------------------------------------------------
+
+function areDatesEqual (d1: Date, d2: Date) {
+  return d1.getFullYear() === d2.getFullYear() &&
+    d1.getMonth() === d2.getMonth() &&
+    d1.getDate() === d2.getDate()
+}
+
+function getDaysDifferences (d1: Date, d2: Date) {
+  return (d1.getTime() - d2.getTime()) / (86400000)
+}