I am creating a node.js endpoint that accepts a start date/time and end date/time as parameters. I had been passing them as a string ie:
var body = {
relatedObjectId: "561ee6bbe4b0f25b4aead5c8",
startTime : "11/13/2015 03:00:00PM",
endTime: "11/13/2015 03:30:00PM"
};
and in my service class:
var timeTicket = new TimeTicket();
timeTicket.tutorId = tutorId;
timeTicket.startTime = new Date(startTime);
timeTicket.endTime = new Date(endTime);
timeTicket.save(function(err, timeTicket){
if(err){
return next(err, null);
}
return next(null, timeTicket);
});
However, the cast always fails so i end up with a date in 1970 for startTime and endTime values. It would seem the obvious solution would be to use a UTC format, but what's the right way to do that?
Either use ISO 8601 format as Phil suggested, or simply pass the date as milliseconds (since 1970).
For example, new Date(1447378736842) is the same as new Date("2015-11-13T01:38:56.842Z").
To get the current date in ISO 8601 format, you might do something like this:
var d = new Date();
var n = d.toISOString();
tl;dr version: This is what your body object should look like. I used milliseconds for startTime and an ISO 8601 string for endTime for demonstration purposes. Both are valid.
var body = {
relatedObjectId: "561ee6bbe4b0f25b4aead5c8",
startTime : 1447378736842,
endTime: "2015-11-13T01:38:56.842Z"
};
Related
I am trying to convert date object to ISOString() formate. But it return me 1 day off ( I mean it reduce 1 day ).
var fromDate = {
day:4,
month:5,
year:2012
}
var fromDateString = new Date(fromDate.year+'-'+fromDate.month+'-'+fromDate.day)
console.log(fromDateString.toISOString())
It is because of timezone, new Date() is in your current timezone, toISOString() is using standard timezone.
I have searched and I find best solution for every date object to convert in any format.
Comment if you agree?
var dateObj = {
day:2,
month:5,
year:2012
}
var date = new Date;
date.setFullYear(dateObj.year,dateObj.month-1,dateObj.day)
console.log(date)
I am trying to convert string to time, the string i have are in this format, '8:3' and '16:45'.
I want to convert UTC time in jQuery.
You can write your function to create UTC date with the time string.
function toUTC(str) {
let [h, m] = str.split(':');
let date = new Date();
date.setHours(h, m, 0)
return date.toUTCString();
}
console.log(toUTC('8:3'))
console.log(toUTC('16:45'))
You don't need jQuery for such operations. Just the simple Date object will do the trick. Say you want to convert time from a specific date.
let date = new Date('2020-04-01'); // leave the Date parameter blank if today
date.setHours(16); // must be 24 hours format
date.setMinutes(45);
let theUTCFormat = date.getUTCDate();
Cheers,
I am trying to create an if statement that can check today's date and time and if it's greater than a predefined date and time, do something. I'm looking to do this in vanilla JS only and get it to work in IE.
This is the basic working code for Chrome.
var ToDate = new Date()
if (new Date("2018-11-30 05:00").getTime() > ToDate.getTime()) {
alert("true")
} else {
alert("false")
}
How can I make something like this work in IE?
if (new Date("2018-11-30 05:00").getTime() > ToDate.getTime()) {
On firefox and chrome there are no issues with it. On Internet Explorer it's false.
On IE (or in general) the string needs to be an RFC2822 or ISO 8601 formatted date
Example:
new Date("2018-11-29T19:15:00.000Z")
If you need portable solution (eg. support older Internet Explorer) I would use this constructor instead:
new Date(year, monthIndex [, day [, hours [, minutes [, seconds [, milliseconds]]]]]);
Keep in mind that monthIndex starts from 0 (January).
Test:
function assertTrue(exp, message) {
if (exp === false) {
message = message || 'Assertion failed';
alert(message);
throw message;
}
}
function testShouldPassForDatesInTheFuture() {
var ToDate = new Date(2018, 10, 29);
assertTrue(new Date(2018, 10, 30).getTime() > ToDate.getTime());
}
function testShouldPassForDatesInThePast() {
var ToDate = new Date(2018, 10, 29);
assertTrue(new Date(2018, 10, 28).getTime() < ToDate.getTime());
}
testShouldPassForDatesInThePast();
testShouldPassForDatesInThePast();
alert('All test passed');
You need to append 'T00:00:00.000Z' to your date.
new Date("2018-11-30" + 'T00:00:00.000Z')
Full code is below:
var ToDate = new Date()
if (new Date("2018-11-30" + 'T00:00:00.000Z').getTime() > ToDate.getTime()) {
alert("true")
} else {
alert("false")
}
Your issue is that the date format YYYY-MM-DD HH:mm is not supported by ECMAScript, so parsing is implementation dependent. Safari, for example:
new Date("2018-11-30 05:00")
returns an invalid date.
You can first parse the string manually, either with a bespoke function (e.g. How to parse a string into a date object at JavaScript?) or a library, then you can compare the result with new Date() as for Compare two dates with JavaScript.
A simple parse function is not difficult:
/* Parse string in YYYY-MM-DD HH:mm:ss to a Date
* All parts after YYYY-MM are optional, milliseconds ignored
*/
function parseDate(s) {
var b = s.split(/\D/);
return new Date(b[0], b[1]-1, b[2]||1, b[3]||0, b[4]||0, b[5]||0);
}
["2018-11-23 17:23",
"2019-01",
"2020-12-31 23:59:59"].forEach(s => {
console.log(`${s} => ${parseDate(s).toString()}`);
});
Then you can compare dates using <, <=, > and >=.
In this case, a date like "2018-01-01" will be considered past at any time after 2018-01-01 00:00:00.000.
Alternatively, since the string is similar to ISO 8601 format, you can compare the parts of the string with a similarly formatted string for today:
// Return date string in YYYY-MM-DD HH:mm:ss format
// Only return as many parts as len, or all 6 if missing
function formatDate(d, len) {
var parts = [d.getFullYear(), '-'+d.getMonth()+1, '-'+d.getDate(), ' '+d.getHours(), ':'+d.getMinutes(), ':'+d.getSeconds()];
var spacer = ['-','-',' ',':',':'];
len = len || 6;
return parts.splice(0, len).join('');
}
['2018-06-30 12:04',
'2018-10',
'2018-12-15 03:14:45',
'2019-01-01',
'2020-12-15 03:14:45'].forEach(s => {
console.log(`${s} has passed? ${s < formatDate(new Date(), s.split(/\D/).length)}`);
});
In this case, 2018-01-01 will be equal to any date generated on that day, and "2018-01" will be equal to any date generated in January 2018. It's up to you whether you use < or <= for the comparison.
So you need to consider carefully where you draw the boundary between earlier and later and adjust the logic accordingly.
I am getting a SQL date - NOT datetime - object pushed into my Javascript code, and I need to see whether it's before today or not. Here is the code I have (the relevant part):
todaysDate = new Date();
todaysDate.setHours(0,0,0,0);
var date = Date.parse(row[3]);
// date.setHours(0,0,0,0);
if (date < todaysDate) {
alert("date is before today");
dueDate = '<small class="text-danger">';
} else {
alert("date is after today");
dueDate = '<small class="text-muted">';
}
row[3] is the source of the SQL date. So, this works fine for everything except dates that are today. Without the commented line, it thinks that anything with today's date is in the past. With the commented line, my code breaks. Any thoughts as to how to fix this? Not sure what I'm doing wrong.
Thanks!
If your date string is like "2016-04-10" and your time zone is west of GMT, say -04:00, then in browsers compliant with ECMAScript 2016 you will get a Date for "2016-04-09T19:00:00-0400".
When you create a Date using new Date() and set the hours to zero (assuming it's 10 April where you are), you'll get a Date for "2016-04-10T00:00:00-0400".
So when compared they have different time values.
What you need is to either treat the string you get from the database as local, or get the UCT date where you are, so:
var dateString = '2016-04-10';
var parsedDate = new Date(dateString);
var todayUTCDate = new Date();
todayUTCDate.setUTCHours(0,0,0,0);
document.write(parsedDate + '<br>' + todayUTCDate);
But not all browsers parse strings according to ECMAScript 2015 so they should always be manually parsed. Use a library, or write a small function, e.g.
// Parse date string in format 'yyyy-mm-dd' as local date
function parseISOLocal(s) {
var b = s.split(/\D/);
return new Date(b[0], b[1]-1, b[2]);
}
and replace:
var date = Date.parse(row[3]);
with:
var date = parseISOLocal(row[3]);
and then in the comparison, compare the time values:
if (+date < +todaysDate) {
or
if (date.getTime() < todaysDate.getTime()) {
Use getTime() of date object.
The getTime() method returns the number of milliseconds between midnight of January 1, 1970 and the specified date.
You can compare miliseconds and do your operations
date.getTime() > todaysDate.getTime()
Also be sure that Date.parse is returning a valid date.
Can I convert iso date to milliseconds?
for example I want to convert this iso
2012-02-10T13:19:11+0000
to milliseconds.
Because I want to compare current date from the created date. And created date is an iso date.
Try this
var date = new Date("11/21/1987 16:00:00"); // some mock date
var milliseconds = date.getTime();
// This will return you the number of milliseconds
// elapsed from January 1, 1970
// if your date is less than that date, the value will be negative
console.log(milliseconds);
EDIT
You've provided an ISO date. It is also accepted by the constructor of the Date object
var myDate = new Date("2012-02-10T13:19:11+0000");
var result = myDate.getTime();
console.log(result);
Edit
The best I've found is to get rid of the offset manually.
var myDate = new Date("2012-02-10T13:19:11+0000");
var offset = myDate.getTimezoneOffset() * 60 * 1000;
var withOffset = myDate.getTime();
var withoutOffset = withOffset - offset;
console.log(withOffset);
console.log(withoutOffset);
Seems working. As far as problems with converting ISO string into the Date object you may refer to the links provided.
EDIT
Fixed the bug with incorrect conversion to milliseconds according to Prasad19sara's comment.
A shorthand of the previous solutions is
var myDate = +new Date("2012-02-10T13:19:11+0000");
It does an on the fly type conversion and directly outputs date in millisecond format.
Another way is also using parse method of Date util which only outputs EPOCH time in milliseconds.
var myDate = Date.parse("2012-02-10T13:19:11+0000");
Another option as of 2017 is to use Date.parse(). MDN's documentation points out, however, that it is unreliable prior to ES5.
var date = new Date(); // today's date and time in ISO format
var myDate = Date.parse(date);
See the fiddle for more details.
Yes, you can do this in a single line
let ms = Date.parse('2019-05-15 07:11:10.673Z');
console.log(ms);//1557904270673
Another possible solution is to compare current date with January 1, 1970, you can get January 1, 1970 by new Date(0);
var date = new Date();
var myDate= date - new Date(0);
Another solution could be to use Number object parser like this:
let result = Number(new Date("2012-02-10T13:19:11+0000"));
let resultWithGetTime = (new Date("2012-02-10T13:19:11+0000")).getTime();
console.log(result);
console.log(resultWithGetTime);
This converts to milliseconds just like getTime() on Date object
var date = new Date()
console.log(" Date in MS last three digit = "+ date.getMilliseconds())
console.log(" MS = "+ Date.now())
Using this we can get date in milliseconds
var date = new Date(date_string);
var milliseconds = date.getTime();
This worked for me!
if wants to convert UTC date to milliseconds
syntax : Date.UTC(year, month, ?day, ?hours, ?min, ?sec, ?milisec);
e.g :
date_in_mili = Date.UTC(2020, 07, 03, 03, 40, 40, 40);
console.log('miliseconds', date_in_mili);
In case if anyone wants to grab only the Time from a ISO Date, following will be helpful. I was searching for that and I couldn't find a question for it. So in case some one sees will be helpful.
let isoDate = '2020-09-28T15:27:15+05:30';
let result = isoDate.match(/\d\d:\d\d/);
console.log(result[0]);
The output will be the only the time from isoDate which is,
15:27