A simple node script to convert a file of date strings to milliseconds.

_usage.sh

./dateparse.js dates.txt out.txt

dateparse.js

#!/usr/bin/env node
var fs = require('fs');

// load file
var datesText = fs.readFileSync(process.argv[2]).toString();

// convert date strings to milliseconds
var times = datesText
	.split('\n')
	.map(function(dateString) {
    return new Date(dateString).getTime();
	})
	.join('\n');

// write times to output file
fs.writeFile(process.argv[3], times);

dates.txt

2014-03-10 00:00
2014-03-18 00:00
2014-04-01 00:00

out.txt

1394431200000
1395122400000
1396332000000