Unix时间戳是从1970年1月1日00:00:00 UTC开始经过的秒数，常用于程序开发中。时间戳转日期使用百分号（%）后跟两个十六进制数字来表示特殊字符。
时间戳转日期示例：
输入：1609459200 → 输出：2021/1/1 00:00:00 (UTC)
日期转时间戳示例：
输入：2021-01-01 00:00:00 → 输出：1609459200
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Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC, commonly used in program development. URL encoding uses a percent sign (%) followed by two hexadecimal digits to represent special characters.
Timestamp to Date Example:
Input: 1609459200 → Output: 2021/1/1 00:00:00 (UTC)
Date to Timestamp Example:
Input: 2021-01-01 00:00:00 → Output: 1609459200
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