# Functions
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字节转换成整形.
字节转换成整形.
字节转整型.
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获取传入的时间所在月份的第一天，即某月第一天的0点。如传入time.Now(), 返回当前月份的第一天0点时间。.
获取传入的时间所在月份的最后一天，即某月最后一天的0点。如传入time.Now(), 返回当前月份的最后一天0点时间。.
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获取某一天的0点时间.
整型转字节.
此方法需要配合上面的 IsNumeric 一起使用.
整形转换成字节.
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Get unique id from Twitter's Snowflake.
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判断文件夹是否存在.
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