Date manipulation: Difference between revisions

// Get the parts of the date string

var parts = dateString.split(/\s+/);

var date = parts[1];

var month = parts[0];

var year = parts[2];

var time = parts[3];

var ampm = time && time.match(/[a-z]+$/i)[0];

var hr = Number(time.split(':')[0]);

var min = Number(time.split(':')[1].replace(/\D/g,''));

var zone = parts[4].toUpperCase();

'July','August','September','October','November','December'];

var zones = {'EST': 300, 'AEST': -600}; // Minutes to add to zone time to get UTC

// Convert month name to number, zero indexed

// Could use indexOf but not supported widely

for (var i=0, iLen=months.length; i<iLen; i++) {

if (months[i] == month) {

month = i;

}

}

if (typeof month != 'number') return; // Invalid month name provided

// Convert hours to 24hr

if (ampm && ampm.toLowerCase() == 'pm') {

hr += 12;

}

// Add 12 hours to hours

hr += 12;

var d = new Date(year, month, date);

d.setHours(hr, min, 0, 0);

// Adjust minutes for the time zones

d.setMinutes(d.getMinutes() + zones[zone] - d.getTimezoneOffset() );

// d is now a local date representing the same moment as the

// source date plus 12 hours

return d;

alert(