The locale is set to en_US by default if the incoming param.locale is empty.
如果传入的param . locale为空，那么在默认情况下，地区设置为en_US。
The time is in the default format of the host environment's current locale.
该时间的格式为宿主环境的当前区域设置中的默认格式。
The date is in the default format of the host environment's current locale.
日期是采用主机环境目前地区设定的预设格式。
The date is in the default format of the host environment's current locale.
日期是采用主机环境目前地区设定的预设格式。
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