The most detailed JS date in history regular expression sharing _ regular expression

Simplest regular example:/d{4}-/d{2}-/d{2}
But the reality is not so simple, to consider, effectiveness and leap year and other issues ...

For a valid range of dates, different scenarios vary. The valid ranges for DateTime objects defined in MSDN are: 0001-01-01 00:00:00 to 9999-12-31 23:59:59.

The Unix timestamp is 0 in accordance with the ISO 8601 specification: 1970-01-01t00:00:00z.

Consider first three rules unrelated to the year, and the year can be unified writing

(?! 0000) [0-9]{4}

Only the regular of month and day is considered below

1. The month of all years, including excepting, contains 1-28 days

(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-8])

2. All years, including excepting, include 29 and 30th except February

(0[13-9]|1[0-2])-(29|30)

3. All years, including excepting, 1, 3, 5, 7, 8, 10, December all included 31st

(0[13578]|1[02])-31)

All other dates except February 29 in a leap year

(?! 0000) [0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-8]) | ( 0[13-9]|1[0-2])-(29|30) | (0[13578]|1[02])-31)

Next, consider the implementation of a leap year

1: Four Years a leap
([0-9]{2} (0[48]|[ 2468][048]| [13579] [26])

2: Hundred years does not leap, 400 year again leap
(0[48]| [2468] [048]| [13579] [26]) 00

3: Together is the February 29 of all leap years
([0-9]{2} (0[48]|[ 2468][048]| [13579] [26]) | (0[48]| [2468] [048]| [13579] [26]) 00)-02-29)

All four rules are implemented and have no effect on each other, and together is the regular of all dates that match the DateTime range

^((?! 0000) [0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-8]) | ( 0[13-9]|1[0-2])-(29|30) | (0[13578]|1[02])-31 | ([0-9]{2} (0[48]|[ 2468][048]| [13579] [26]) | (0[48]| [2468] [048]| [13579] [26]) 00)-02-29) $

Given that this regular expression is used only as validation, capturing groups are meaningless, consume resources and affect the efficiency of matching, so you can use a non-capturing group for optimization.

^(?:(?! 0000) [0-9]{4}-(?:(?: 0 [1-9]|1[0-2])-(?: 0 [1-9]|1[0-9]|2[0-8]) | (?: 0 [13-9]|1[0-2])-(?: 29|30) | (?: 0 [13578]|1[02])-31 | (?: [0-9]{2} (?: 0 [48]| [2468] [048]| [13579] [26]) | (?: 0 [48]| [2468] [048]| [13579] [26]) 00)-02-29) $
Category: JavaScript

JS Date Regular Expressions Support month-day validation
This JS date regular expression support month-day validation, we will give an example to illustrate the date validation expression of the function instance.

function IsDate (str) {
var result=str.match (/^ (D{4}) (-|/) (d{1,2}) 2 (d{1,2}) $/);
if (result==null) return false;
var d=new Date (Result[1], result[3]-1, result[4]);
Return (D.getfullyear () ==result[1] && d.getmonth () +1==result[3] && d.getdate () ==result[4]);
}

Check for Yyyy-mm-dd | | Date format for YYYY/MM/DD

Face only the regular of month and day

1. The month of all years, including excepting, contains 1-28 days

(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-8])
2. All years, including excepting, include 29 and 30th except February

(0[13-9]|1[0-2])-(29|30)
3. All years, including excepting, 1, 3, 5, 7, 8, 10, December all included 31st

(0[13578]|1[02])-31)
All other dates except February 29 in a leap year

(?! 0000) [0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-8]) | ( 0[13-9]|1[0-2])-(29|30) | (0[13578]|1[02])-31)
function Isdatetime (str)
{
var result=str.match (/^ (D{4}) (-|/) (d{1,2}) 2 (d{1,2}) (d{1,2}):(d{1,2}):(d{1,2);
if (result==null) return false;
var d= new Date (result[1], result[3]-1, result[4], result[5], result[6], result[7]);
Return (D.getfullyear () ==result[1]&& (D.getmonth () +1) ==result[3]&&d.getdate () ==result[4]& &d.gethours () ==result[5]&&d.getminutes () ==result[6]&&d.getseconds () ==result[7]);
}

Determine if the input is a valid long date format-"Yyyy-mm-dd HH:MM:SS" | | "Yyyy/mm/dd HH:MM:SS"

This is Yyyy-mm-dd hh:mm:ss.

/^ (D{4})-(D{2})-(d{2}) (D{2}):(d{2}):(d{2}) $/;

This is Yyyy-mm-ddde.

/^ (D{4})-(D{2})-(d{2}) $/