php的日期处理经验集

//由年、月、日合成日期
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function dateserial($nyear,$nmonth,$nday)
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{
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return date("Y/n/j",mktime(0,0,0,$nmonth,$nday,$nyear));
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}
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$now_rq=date("Y/n/j");//去现在的日期
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$year=date('Y');//取得年
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$month=date('m');//取月
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$month=date('j');//取日
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//由月份取得所在季度的第一天和最后一天
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switch($month){
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case 1:
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case 2:
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case 3:
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$quarter_begin=dateserial($year-1,10,1);
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$quarter_end=dateserial($year-1,12,31);
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break;
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case 4:
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case 5:
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case 6:
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$quarter_begin=dateserial($year,1,1);
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$quarter_end=dateserial($year,3,31);
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break;
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case 7:
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case 8:
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case 9:
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$quarter_begin=dateserial($year,4,1);
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$quarter_end=dateserial($year,6,30);
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break;
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case 10:
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case 11:
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case 12:
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$quarter_begin=dateserial($year,7,1);
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$quarter_end=dateserial($year,9,30);
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break;
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}
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