var timeArr = moment().format(\'HH:mm:ss\').split(\':\'); var timeInMilliseconds = (timeArr[0] * 3600000) + (timeArr[1] * 60000);
This solution works,
You could subtract the current time stamp from 12 AM of the same day.
Using current timestamp:
moment().valueOf() - moment().startOf('day').valueOf()
Using arbitrary day:
moment(someDate).valueOf() - moment(someDate).startOf('day').valueOf()