日期特殊操作控制类-php手册-PHP中文网

控制

//日期特殊操作控制类
//宇凡 8月15日
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//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 {
$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 {
$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 {
$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;$i {
   switch ($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;$i {
   switch ($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;
}