Moment.js Deep Dive

// create a moment object from the Date of Birth field
var dateOfBirth = moment($('#jdr_dateofbirth').val());

// check whether dateOfBirth is before now
var now = moment();
if(dateOfBirth.isBefore(now)) { true } else { false }

// calcuate 'time ago' when a message was received (output as a string e.g. 2 weeks ago)
var dateReceived = moment($('#jdr_datereceived').val());
var dateReceivedString = dateReceived.fromNow();

// calculate age from date of birth as number
var calculatedAge = moment().diff(dateOfBirth, 'years');
console.log(calculatedAge);

var dateFrom = moment($('#jdr_datefrom').val());
var dateTo = moment($('#jdr_dateto').val());
var periodWorked = dateFrom.diff(dateTo, 'years');

// Combining date diff with a duration in a given unit
var calculatedAgeDecimal = moment.duration(moment().diff(dateOfBirth))


var maxDatePermitted = moment($('#jdr_dateFrom').val()).add(5, 'years');
// only allow to dates within 5 years of the dateFrom
$('#jdr_dateto').next().data('DateTimePicker').maxDate(moment($('#jdr_datefrom').val()).add(5, 'years'));

// only allow to dates within the next 5 years
$('#jdr_dateto').next().data('DateTimePicker').maxDate(moment().add(5, 'years'));

// only allow to dates later than form date
$('#jdr_dateto').next().data('DateTimePicker').minDate(moment($('#jdr_datefrom').val()));