Change file timestamps of the file referenced by the supplied path.

Note: the arguments `atime` and `mtime` of the following related functions does

follow the below rules:

- If the value is a numberable string like "123456789", the value would get

converted to corresponding number.

- If the value is `NaN` or `Infinity`, the value would get converted to

`Date.now()`.

## fs.utimesSync(path, atime, mtime)

Synchronous version of `fs.utimes()`. Returns `undefined`.

// converts Date or number to a fractional UNIX timestamp

function toUnixTimestamp(time) {

if (typeof time === 'string' && +time == time) {

return +time;

}

if (typeof time === 'number') {

if (!Number.isFinite(time) || time < 0) {

return Date.now() / 1000;

}

return time;

}

if (util.isDate(time)) {

var stats = fs.statSync(__filename);

// run tests

runTest(new Date('1982-09-10 13:37'), new Date('1982-09-10 13:37'), function() {

runTest(new Date(), new Date(), function() {

runTest(123456.789, 123456.789, function() {

runTest(stats.mtime, stats.mtime, function() {

// done

runTest(NaN, Infinity, function() {

runTest('123456', -1, function() {

// done

});

});

});

});

});

});

process.on('exit', function() {

console.log('Tests run / ok:', tests_run, '/', tests_ok);

assert.equal(tests_ok, tests_run);