JavaScript idate

Format a local time/date as integer

function idate(format, timestamp) {
    // Format a local time/date as integer  
    // 
    // version: 911.2217
    // discuss at: http://phpjs.org/functions/idate    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +      input by: Alex
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // +   improved by: Theriault
    // +  derived from: date    // +  derived from: gettimeofday
    // *     example 1: idate('y');
    // *     returns 1: 9
    if (format === undefined) {
        throw 'idate() expects at least 1 parameter, 0 given';    }
    if (!format.length || format.length > 1) {
        throw 'idate format is one char';
    }
     // Fix: Need to allow date_default_timezone_set() (check for this.php_js.default_timezone and use)
    var date = (
        (typeof timestamp === 'undefined') ? new Date() : // Not provided
        (timestamp instanceof Date) ? new Date(timestamp) : // Javascript Date()
        new Date(timestamp * 1000) // UNIX timestamp (auto-convert to int)    ), a;
 
    switch (format) {
        case 'B':
            return Math.floor(((date.getUTCHours() * 36e2) + (date.getUTCMinutes() * 60) +                                                date.getUTCSeconds() + 36e2) / 86.4) % 1e3;
        case 'd':
            return date.getDate();
        case 'h':
            return date.getHours() % 12 || 12;        case 'H':
            return date.getHours();
        case 'i':
            return date.getMinutes();
        case 'I': // capital 'i'            // Logic derived from getimeofday().
            // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
            // If they are not equal, then DST is observed.
            a = date.getFullYear();
            return 0 + (((new Date(a, 0)) - Date.UTC(a, 0)) !== ((new Date(a, 6)) - Date.UTC(a, 6)));        case 'L':
            a = date.getFullYear();
            return (!(a & 3) && (a % 1e2 || !(a % 4e2))) ? 1 : 0;
        case 'm':
            return date.getMonth() + 1;        case 's':
            return date.getSeconds();
        case 't':
            return (new Date(date.getFullYear(), date.getMonth() + 1, 0)).getDate();
        case 'U':            return Math.round(date.getTime() / 1000);
        case 'w':
            return date.getDay();
        case 'W':
            a = new Date(date.getFullYear(), date.getMonth(), date.getDate() - (date.getDay() || 7) + 3);            return 1 + Math.round((a - (new Date(a.getFullYear(), 0, 4))) / 864e5 / 7);
        case 'y':
            return parseInt((date.getFullYear() + '').slice(2), 10); // This function returns an integer, unlike date()
        case 'Y':
            return date.getFullYear();        case 'z':
            return Math.floor((date - new Date(date.getFullYear(), 0, 1)) / 864e5);
        case 'Z':
            return -date.getTimezoneOffset() * 60;
        default:            throw 'Unrecognized date format token';
    }
}

external links: original PHP docs | raw js source

Examples

Running

1	idate('y');

Should return

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have idate goodness in JavaScript.

Brett Zamir ( original bugfixed )
Alex ( input )
Theriault ( improved )
date ( derived )
gettimeofday ( derived )

Comments

Add Comment

Name

Website

Title

Content

Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Brett Zamir
Jan 20th

JSLint, as good as it is, really needs more configuration options. I would venture a guess that maybe the reason is because the indents at the end are otherwise confusing:

switch(v) {
    case 'a':
        break;
    default:
 ...lots of stuff here...
 
 
        break;
   // Might be tempting to put ending bracket here   // or add one here since the indent before this line 
  // is twice as much as the next
}

That being said, I don't like all of JSLint's provisions, including this one, as well as even the one forbidding fall-throughs. There has to be room for different coding styles too. I bet Douglas Crockford may be open to patches which did allow configuration if someone submitted the patches...

Thériault
Jan 19th

For some reason, JSLint wants the cases of a switch statement to be lined up with the switch statement itself:

switch (expression) {
case 1:
    ...
case 2:
    ...}

...instead of the more readable....

switch (expression) {
    case 1:
        ...
    case 2:
        ...}

I don't understand why it wants this.

Contribute a New function

JavaScript idate

Examples

Dependencies

Open syntax issues

Authors

More functions

Support us