PHP Time Common operation function

1. Determine the day of the week /** * Determine the day of the week * @param $date format ' YYYY-MM-DD ' format error returns false to correctly return a day from Monday to Sunday of the corresponding date */ function Get_weekday ($date) { $date _arr = Explode ('-', trim ($date)); if (!checkdate (Intval ($date _arr[1)), Intval ($date _arr[2]), Intval ($date _arr[0])) { return false; } Switch (date (' W ', Strtotime ($date))) { Case ' 0 ': $weekday = ' Day '; Break Case ' 1 ': $weekday = ' one '; Break Case ' 2 ': $weekday = ' two '; Break Case ' 3 ': $weekday = ' three '; Break Case ' 4 ': $weekday = ' four '; Break Case ' 5 ': $weekday = ' five '; Break Case ' 6 ': $weekday = ' VI '; Break Default return false; Break } return $weekday; } Demo_ Call $day = ' 2014-02-16 '; if (Get_weekday ($day)) { $test 1 = get_weekday ($day); Echo ' Week '. $test 1. ' '; }else{ Echo ' date error '; } Copy Code 2. Determine if the date format is correct /** * Determine if the date format is correct * Judging Format Yyyy-mm-dd | YYYY-MM-DD Hh:ii:ss * @param $tdate to determine the date * @param $dateformat to determine the date format "y-m-d" or "y-m-d h:i:s" */ function Is_date ($tdate, $dateformat = "y-m-d") { $tdate = Trim ($tdate); cannot be converted to timestamp if (!is_numeric (Strtotime ($tdate))) return false; Determine if the date exists && month date format is y-m-d $tdate _date = Explode ("", $tdate); $tdate _time = Explode ("-", $tdate _date[0]); if (Isset ($tdate _time[0)) $year = $tdate _time[0]; Else return false; if (Isset ($tdate _time[1)) $month = $tdate _time[1]; Else return false; if (Isset ($tdate _time[2)) $day = $tdate _time[2]; Else return false; if (!checkdate ($month, $day, $year)) return false; Determines whether the date is in the specified format $tmpdate = Date ($dateformat, Strtotime ($tdate)); if ($tmpdate = = $tdate) return true; Else return false; } /** Use demo */ $tdate = ' 2014-02-16 11:25:33 '; $tdate = ' 2014-02-16 '; $tdate = ' 2014.02.16 '; $tdate = ' Asdqwe123123sadsad '; $dateformat = ' y-m-d '; $dateformat = "Y-m-d h:i:s"; if (Is_date ($tdate, $dateformat)) { Echo ' true '; }else{ echo ' false '; } Copy Code 3. Returns the date of all days between two dates /** * Returns the date of all days between two dates * Dependent Is_date () * @param $tdate 1 $tdate 2 must be in ' y-m-d ' format * $tdate 1<= $tdate 2 * Return string */ function Getalldatebetdays ($tdate 1, $tdate 2) { $dateformat = ' y-m-d '; if (!is_date ($tdate 1, $dateformat)) return "date parameter 1 format error"; if (!is_date ($tdate 2, $dateformat)) return "date parameter 2 format error"; if ($tdate 1> $tdate 2) return "date parameter 2 must be greater than or equal to date parameter 1"; $days = "'". $tdate 1. "'"; while ($tdate 1< $tdate 2) { $days. = "'". Date ("Y-m-d", Strtotime ($tdate 1) +86400). "'"; $tdate 1 = date ("y-m-d", Strtotime ($tdate 1) +86400); } return $days; } /** Use_demo */ $tdate 1 = ' 2014-02-01 '; $tdate 1 = ' Asdqwe123123sadsad '; $tdate 2 = ' 2014-02-30 '; Echo getalldatebetdays ($tdate 1, $tdate 2); Copy Code 4. Determine if the month format is correct /** * Determine if the month format is correct * Judging Format yyyy-mm * @param $tmonth to determine the month * @param $monformat to determine the month date "Y-m" */ function Is_month ($tmonth, $monformat = "Y-m") { $tmonth = Trim ($tmonth); cannot be converted to timestamp if (!is_numeric (Strtotime ($tmonth))) return false; Determines whether the month is a specified format $tmpmonth = Date ($monformat, Strtotime ($tmonth)); if ($tmpmonth = = $tmonth) return true; Else return false; } /** Use_demo */ $month = ' 02.16 '; $month = ' 2014-02 '; $monformat = "Y-m"; if (Is_month ($month, $monformat)) if (Is_month ($month)) Echo ' true '; Else echo ' false '; Copy Code 5. Returns all months between two months /** * Returns all months between two months * @param $tmonth 1 $tmonth 2 must $tmonth 1< $tmonth 2 * Return String */ function Gatallmonbetmons ($tmonth 1, $tmonth 2) { $dateformat = "Y-m"; if (!is_month ($tmonth 1, $dateformat)) return "month parameter 1 format error"; if (!is_month ($tmonth 2, $dateformat)) return "Month parameter 2 format error"; if ($tmonth 1> $tmonth 2) return "month parameter 2 must be greater than or equal to the month parameter 1"; $months = "'". $tmonth 1. "'"; while ($tmonth 1< $tmonth 2) { $months. = "'". Date ("Y-m", Strtotime ($tmonth 1. "-01". "+1 Month")). "'"; $tmonth 1 = date ("Y-m", Strtotime ($tmonth 1.) "-01". "+1 Month")); } return $months; } /** Use_demo */ $month 1 = ' 2013-01 '; $month 2 = ' 2014-02 '; Echo gatallmonbetmons ($month 1, $month 2); Copy Code 6. Date acquired relative to the current point in time /** * Relative to current point-in-time date acquisition * @param $needle "0": All Date Value "1": Yesterday "2": "3": the Day before Yesterday "4": Last month Today "5": Tomorrow * Last month today, if the number of days in the month is less than this month and the number of days is missing, the default is to return * Return corresponding date value JSON format */ function Getneeddate ($needle) { $tdate = Date ("Y-m-d", Time ()); $NeedDate = Array (); $NeedDate [1] = date ("Y-m-d", Time ()-86400); $NeedDate [2] = date ("Y-m-d", Time () -86400*2); $NeedDate [3] = date ("Y-m-d", Time () -86400*7); Days of last month $LMD _num = Date ("T", Strtotime (Date ("Y-m-d", Time ()). "-1 month")); Today is the first day of the month $tod _num = Date ("J", Time ()); if ($tod _num<= $lmd _num) { $NeedDate [4] = date ("Y-m", Strtotime (Date ("Y-m-d", Time ()). "-1 month")). '-' . $tod _num; }else{ $NeedDate [4] = date ("Y-m", Strtotime (Date ("Y-m-d", Time ()). "-1 month")). '-' . $LMD _num; } $NeedDate [5] = date ("Y-m-d", Time () +86400); Switch ($needle) { Case 0: Return Json_encode ($NeedDate); Break Case 1: return Json_encode ($NeedDate [1]); Break Case 2: return Json_encode ($NeedDate [2]); Break Case 3: return Json_encode ($NeedDate [3]); Break Case 4: return Json_encode ($NeedDate [4]); Break Default return false; Break } } /** Use_demo */ Var_dump (Json_decode (getneeddate (0), true)); Var_dump (Json_decode (Getneeddate (4), true)); Copy Code 7. Leap Year judgment /** * Leap Year judgment * Leap Year calculation: * 1. Century can be divisible by 400 * 2. Average year can be divisible by 4, but not divisible by 100 * @param $year */ function Isbissextile ($year) { $year = Intval (Trim ($year)); $preg = "/^\d{4,}$/"; if (!preg_match ($preg, $year)) return false; if ($year%400==0) { return true; }elseif ($year%4==0 && $year%100!=0) { return true; }else{ return false; } } /** Use demo */ $year = ' 2012 '; if (Isbissextile ($year)) Echo ' true '; Else echo ' false '; Copy Code 8. Number of days between two dates /** * Number of days between two dates * Dependent is_date * @param $tdate 1 $tdate 2 $tdate 1<= $tdate 2 dateformat: "Y-m-d" */ function Getintervaldays ($tdate 1, $tdate 2) { $dateformat = ' y-m-d '; if (!is_date ($tdate 1, $dateformat)) return "date parameter 1 format error"; if (!is_date ($tdate 2, $dateformat)) return "date parameter 2 format error"; if ($tdate 1> $tdate 2) return "date parameter 2 must be greater than or equal to date parameter 1"; $days = Ceil ((Strtotime ($tdate 2)-strtotime ($tdate 1))/86400); return $days; } /** Use demo */ $tdate 1 = ' 2014-01-01 '; $tdate 2 = ' 2014-01-16 '; Echo getintervaldays ($tdate 1, $tdate 2); Copy Code

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