1、週轉日,全年第n周的起止日
public function dayFromWeek($week,$year=0){ $year = empty($year)?date('Y'):$year; $year_start = mktime(0,0,0,1,1,$year); // 判斷第一天是否爲第一週的開始 if (1 == date('W',$year_start)){ $start = $year_start;//把第一天做爲第一週的開始 }else{ $start = strtotime('next Monday', $year_start); } // 第幾周的開始時間 if (0 == $week){ $weekday['start'] = strtotime('last Monday', $year_start); }elseif (1 == $week){ $weekday['start'] = $start; }else{ $weekday['start'] = strtotime('+'.($week-0).' monday',$start); } // 第幾周的結束時間 $weekday['end'] = strtotime('+1 sunday',$weekday['start']); $weekday['start'] = date("Y-m-d",$weekday['start']); $weekday['end'] = date("Y-m-d",$weekday['end']); return $weekday; }
2、月起止日
public function dayFromMonth($month, $year=0){ $year = empty($year)?date('Y'):$year; $month = strlen($month)==2?$month:'0'.$month; $startDay = $year.'-'.$month.'-01'; $endDay = date('Y-m-d', strtotime(date('Y-m-01', strtotime($startDay)) . ' +1 month -1 day')); return ['start'=>$startDay, 'end'=>$endDay]; }
3、月起止周,當月跨過了哪些周
public function weekFromMonth($month, $year=0){ $day = $this->dayFromMonth($month, $year); return ['start'=>date('W',strtotime($day['start'])),'end'=>date('W',strtotime($day['end']))]; }
4、第幾周在當月的起止日
public function dayFromWM($week,$month,$year=0){ $year = empty($year)?date('Y'):$year; $year_start = mktime(0,0,0,1,1,$year); $year_end = mktime(0,0,0,12,31,$year); $month_start = $year.'-'.$month.'-01'; $month_end = date('Y-m-d', strtotime(date('Y-m-01', strtotime($month_start)) . ' +1 month -1 day')); // 判斷第一天是否爲第一週的開始 if (intval(date('W',$year_start))===1){ $start = $year_start;//把第一天做爲第一週的開始 }else{ $start = strtotime('next Monday', $year_start); } // 第幾周的開始時間 if ($week===0){ $weekday['start'] = strtotime('last Monday', $year_start); }elseif ($week===1){ $weekday['start'] = $start; }else{ $weekday['start'] = strtotime('+'.($week-0).' monday',$start); } // 第幾周的結束時間 $weekday['end'] = strtotime('+1 sunday',$weekday['start']); if (date('m',$weekday['end'])!=$month){ $weekday['end'] = $month_end; }else{ $weekday['end'] = date("Y-m-d",$weekday['end']); } if (date('m', $weekday['start'])!=$month){ $weekday['start'] = $month_start; }else{ $weekday['start'] = date("Y-m-d",$weekday['start']); } return $weekday; }