feat: add some feature

src/main/kotlin/cn/rtast/fancybot/util/DateUtil.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/8/29
+ */
+
+
+package cn.rtast.fancybot.util
+
+import java.time.Instant
+import java.time.LocalDate
+import java.time.ZoneId
+
+fun Long.isSameDay(other: Long): Boolean {
+    val currentDate = LocalDate.now()
+    val dateToCompare = Instant.ofEpochSecond(other)
+        .atZone(ZoneId.systemDefault())
+        .toLocalDate()
+    return currentDate == dateToCompare
+}