1月4日是阳历年的第4天，离一年的结束还有361天(闰年是362天)。
January 4 is the fourth day of the year in the Gregorian calendar. There are 361 days remaining until the end of the year (362 in leap years).
1月21日是阳历年的第21天，离一年的结束还有344天(闰年是345天)。
January 21 is the 21st day of the year in the Gregorian calendar. There are 344 days remaining until the end of the year (345 in leap years).
1月16日是阳历年的第16天，离一年的结束还有349天(闰年是350天)。
January 16 is the 16th day of the year in the Gregorian calendar. There are 349 days remaining until the end of the year (350 in leap years).
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