docs: 添加管理平台标准加密算法 Kotlin 参考实现

docs/工具箱端-授权对接指南/utils/DateUtil.kt

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+package top.tangyh.lamp.filing.utils
+
+import java.text.SimpleDateFormat
+import java.util.*
+
+class DateUtil {
+
+    companion object {
+        // 获取当前时间戳
+        fun getCurrentTimestamp(): Long {
+            return System.currentTimeMillis()
+        }
+
+        // 格式化日期
+        fun formatDate(date: Date, format: String = "yyyy-MM-dd HH:mm:ss"): String {
+            val sdf = SimpleDateFormat(format)
+            return sdf.format(date)
+        }
+
+        // 解析日期字符串
+        fun parseDate(dateString: String, format: String = "yyyy-MM-dd HH:mm:ss"): Date? {
+            val sdf = SimpleDateFormat(format)
+            return try {
+                sdf.parse(dateString)
+            } catch (e: Exception) {
+                null
+            }
+        }
+
+        // 计算两个日期之间的天数差
+        fun getDaysBetweenDates(date1: Date, date2: Date): Long {
+            val diff = Math.abs(date1.time - date2.time)
+            return diff / (24 * 60 * 60 * 1000)
+        }
+
+        // 获取当前时间并格式化为 yyyy-MM-dd_HH-mm-ss
+        fun getCurrentFormattedTime(format: String = "yyyy-MM-dd_HH-mm-ss"): String {
+            val sdf = SimpleDateFormat(format)
+            return sdf.format(Date())
+        }
+    }
+}