static/ext/src/lang/Date.js
function(date, colon) {
        var offset = date.getTimezoneOffset();
        return (offset > 0 ? "-" : "+")
            + Ext.String.leftPad(Math.floor(Math.abs(offset) / 60), 2, "0")
            + (colon ? ":" : "")
            + Ext.String.leftPad(Math.abs(offset % 60), 2, "0");
    }
function(date, colon) {
        var offset = date.getTimezoneOffset();
        return (offset > 0 ? "-" : "+")
            + Ext.String.leftPad(Math.floor(Math.abs(offset) / 60), 2, "0")
            + (colon ? ":" : "")
            + Ext.String.leftPad(Math.abs(offset % 60), 2, "0");
    }
function ( date , colon ) { var offset = date . getTimezoneOffset ( ) ; return ( offset > 0 ? "-" : "+" ) + Ext . String . leftPad ( Math . floor ( Math . abs ( offset ) / 60 ) , 2 , "0" ) + ( colon ? ":" : "" ) + Ext . String . leftPad ( Math . abs ( offset % 60 ) , 2 , "0" ) ; }
Get the offset from GMT of the current date (equivalent to the format specifier 'O').
@param {Date} date The date
@param {Boolean} [colon=false] (optional) true to separate the hours and minutes with a colon.
@return {String} The 4-character offset string prefixed with + or - (e.g. '-0600').
Get the offset from GMT of the current date ( equivalent to the format specifier O ) .