[Bug] RotateTime.level()

[lyb9891]

System (please complete the following information):

• OS: macOS
• GO Version: 1.21.0
• Pkg Version: 0.5.4

Describe the bug

当我配置按日期的方式来滚动日志时，当大于 1 天时只能按 1 天来滚动日志。

To Reproduce

seconds := 604800 // 7天
handler.NewTimeRotateFileHandler(
		logFile,
		rotatefile.RotateTime(seconds),
		handler.WithLogLevels(parseLevels(log.level)),
		handler.WithBuffSize(log.bufferSize),
		handler.WithBackupNum(log.maxBackups),
		handler.WithCompress(log.compress),
		handler.WithFilePerm(log.filePerm),

请查看一下这个方法 RotateTime.level