日期特殊操作控制类

2024-05-04 22:59:25

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<?
//日期特殊操作控制类
//宇凡 8月15日
?>
<?
//获取"yyyy-mm-dd"格式的当前时间
function nowdate()
{
$result = date("y")."-".date("m")."-".date("d");
return $result;
}

//获取"yyyy-mm-dd hh:ii:ss"格式的当前时间
function nowdatetime()
{
$result = date("y")."-".date("m")."-".date("d")." ".date("h").":".date("i").":".date("s");
return $result;
}

//从"yyyy-mm-dd"格式的时间中提取年
function getyear($date)
{
$pos = strpos($date,"-");
$result = "";
for ($i=0;$i<$pos;$i++)
{
$result = $result.$date[$i];
}
$month = getmonth($date);
$day = getday($date);
if (!checkdate($month,$day,$result))
{
$result = false;
}
return $result;
}

//从"yyyy-mm-dd"格式的时间中提取月
function getmonth($date)
{
$pos1 = strpos($date,"-");
$pos2 = strrpos($date,"-");
$result = "";
for ($i=$pos1+1;$i<$pos2;$i++)
{
$result = $result.$date[$i];
}
$year = getyear($date);
$day = getday($date);
if (!checkdate($result,$day,$year))
{
$result = false;
}
return $result;
}

//从"yyyy-mm-dd"格式的时间中提取日
function getday($date)
{
$pos = strrpos($date,"-");
$result = "";
for ($i=$pos+1;$i<10;$i++)
{
$result = $result.$date[$i];
}
$year = getyear($date);
$month = getday($date);
if (!checkdate($month,$result,$year))
{
$result = false;
}
return $result;
return $result;
}

//检查闰年，返回布尔值
function checkleap($year)
{
$result = (($year % 4 == 0) && (($year % 100 <> 0) || ($year % 400 == 0)));
return $result;
}

//在当前日期上加天数返回"yyyy-mm-dd"格式的时间
function addday($offset)
{
$year=date("y");
$month=date("m");
$day=date("d");
for ($i=0;$i<$offset;$i++)
{
   switch ($month) {
   case 1:
   {
    if ($day==31) {
     $day = 1;
     $month = 2;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 2:
   {
    if (checkleap($year)) {
     if ($day == 29) {
     $day = 1;
     $month = 3;
     }
     else {
     $day=$day + 1;
     }
    }
    else {
     if ($day == 28) {
     $day = 1;
     $month = 3;
     }
     else {
     $day=$day + 1;
     }
    }
   }
   break;
   case 3:
   {
    if ($day==31) {
     $day = 1;
     $month = 4;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 4:
   {
    if ($day==30) {
     $day = 1;
     $month = 5;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 5:
   {
    if ($day==31) {
     $day = 1;
     $month = 6;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 6:
   {
    if ($day==30) {
     $day = 1;
     $month = 7;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 7:
   {
    if ($day==31) {
     $day = 1;
     $month = 8;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 8:
   {
    if ($day==31) {
     $day = 1;
     $month = 9;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 9:
   {
    if ($day==30) {
     $day = 1;
     $month = 10;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 10:
   {
    if ($day==31) {
     $day = 1;
     $month = 11;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 11:
   {
    if ($day==30) {
     $day = 1;
     $month = 12;
    }
    else {
     $day=$day + 1;
    }
   }
   break;
   case 12:
   {
    if ($day==31) {
     $day = 1;
     $month = 1;
     $year = $year + 1;
    }
    else {
     $day=$day + 1;
    }
   }
   }
}
$result=$year."-".$month."-".$day;
return $result;
}

//在当前日期上减天数返回"yyyy-mm-dd"格式的时间
function abateday($offset)
{
$year=date("y");
$month=date("m");
$day=date("d");
for ($i=0;$i<$offset;$i++)
{
   switch ($month) {
   case 1:
   {
    if ($day==1) {
     $day = 31;
     $month = 12;
     $year = $year - 1;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 2:
   {
    if ($day == 1) {
     $day = 31;
     $month = 1;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 3:
   {
    if ($day == 1) {
     if (checkleap($year)) {
      $day = 29;
     }
     else {
      $day = 28;
     }
     $month = 2;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 4:
   {
    if ($day == 1) {
     $day = 31;
     $month = 3;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 5:
   {
    if ($day == 1) {
     $day = 30;
     $month = 4;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 6:
   {
    if ($day == 1) {
     $day = 31;
     $month = 5;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 7:
   {
    if ($day == 1) {
     $day = 30;
     $month = 6;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 8:
   {
    if ($day == 1) {
     $day = 31;
     $month = 7;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 9:
   {
    if ($day == 1) {
     $day = 31;
     $month = 8;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 10:
   {
    if ($day == 1) {
     $day = 30;
     $month = 9;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 11:
   {
    if ($day == 1) {
     $day = 31;
     $month = 10;
    }
    else {
     $day=$day - 1;
    }
   }
   break;
   case 12:
   {
    if ($day == 1) {
     $day = 30;
     $month = 11;
    }
    else {
     $day=$day - 1;
    }
   }
   }
}
$result=$year."-".$month."-".$day;
return $result;
}

//获取当前周第一天返回"yyyy-mm-dd"格式的时间
function firstdayofthisweek()
{
$offset=date("w");
if ($offset==0)
{
$offset=7;
}
$offset--;
$result = abateday($offset);
return $result;
}

//获取当前周最后一天返回"yyyy-mm-dd"格式的时间
function lastdayofthisweek()
{
$offset=date("w");
if ($offset==0)
{
   $offset=7;
}
$offset = 7 - $offset;
$result = addday($offset);
return $result;
}

//获取指定月的天数
function daysamountofthismonth($month,$year)
{
switch ($month) {
   case 1:
    $result = 31;
    break;
   case 2:
   {
    if (checkleap($year)) {
     $result = 29;
    } else {
     $result = 28;
    }
    break;
   }
   case 3:
    $result = 31;
    break;
   case 4:
    $result = 30;
    break;
   case 5:
    $result = 31;
    break;
   case 6:
    $result = 30;
    break;
   case 7:
    $result = 31;
    break;
   case 8:
    $result = 31;
    break;
   case 9:
    $result = 30;
    break;
   case 10:
    $result = 31;
    break;
   case 11:
    $result = 30;
    break;
   case 12:
    $result = 31;
    break;
}
return $result;
}