JavaScript Date() returns the wrong time - Stack Overflow

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My simple test:

var ds = "2018/2/28 15:59";
console.log(ds);
var da = Date(ds);
console.log(da);
ds = "2018-2-28 15:59";
console.log(ds);
var da = Date(ds);
console.log(da);

My simple test:

var ds = "2018/2/28 15:59";
console.log(ds);
var da = Date(ds);
console.log(da);
ds = "2018-2-28 15:59";
console.log(ds);
var da = Date(ds);
console.log(da);

The results are

2018/2/28 15:59  
Thu Feb 01 2018 17:26:57 GMT+0800 (+08)  
2018-2-28 15:59  
Thu Feb 01 2018 17:26:57 GMT+0800 (+08)  

Even given the time "2018/2/28 15:59" is in a different time zone, it is still very puzzling as the minutes and seconds are different: 59:00 versus 26:57. Timezone differences are in multiples of 30 minutes.

• javascript
• date

Share Improve this question Follow edited Feb 1, 2018 at 9:39 Mike Donkers 3,69922 gold badges2222 silver badges3434 bronze badges asked Feb 1, 2018 at 9:32 user3098791user3098791 3911 gold badge22 silver badges66 bronze badges 5

• Why don't you use "new Date(...)" instead of just "Date(...)"? w3schools./jsref/jsref_obj_date.asp w3schools./js/js_dates.asp – D. Braun Commented Feb 1, 2018 at 9:40
• Notice how the date is wrong too. Your argument is being ignored and you would get the same result from a plain Date(). (Date() acts differently when not used as a constructor, like in new Date(). The latter isn’t guaranteed to parse many formats either, though, so just avoid it entirely.) – Ry- ♦ Commented Feb 1, 2018 at 9:40
• Why don't you use moment.js for parsing and dormatting Dates: momentjs. – D. Braun Commented Feb 1, 2018 at 9:41
• Look at your wrist watch. Does it match the result you get? – Álvaro González Commented Feb 1, 2018 at 9:41
• Regarding "Timezone differences are in multiples of 30", not necessarily. Some are 15 or 45 minutes, e.g. Nepal Standard Time is UTC+05:45 and Chatham Standard Time is UTC+12:45. Once you add "new", your next question will be answered by Why does Date.parse give incorrect results? – RobG Commented Feb 1, 2018 at 12:38

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 6

You forgot to add new before Date().

This means you were just calling a function called Date() which (by default) retuns the current date and time.

var ds = "2018/2/28 15:59";
console.log(ds);
var da = new Date(ds);
console.log(da);
ds = "2018-2-28 15:59";
console.log(ds);
var da = new Date(ds);
console.log(da);

---

An addition to AuxTacos answer, the proper way to init. your date:

var da = new Date(2018, (2-1), 28, 15, 59); // x-1 because 0=Jan,1=Feb...
console.log(date);

In addition to zeropublix's answer (you forgot the new), your date strings are invalid. The proper way to encode "15 hours and 59 minutes past the midnight marking the beginning of the 28th day of February, 2018 CE" is "2018-02-28T15:59Z". Your system (and mine) might recognize "2018/2/28 15:59" as a valid date string, but that's implementation-dependent and prone to failure. The only format recognized in the specification is a simplification of ISO 8601.

I try this.

var ds = "2018/2/28 15:59"; 
var da = new Date(ds);

it gives me Date 2018-02-28T15:59:00.000Z. I got right time and date.

var da = Date(ds); here Date gives the current time even if you pass parameter.

try this.

var ds = "2018/2/28 15:59"; var da = new Date(ds);

which gives 2018-02-28T10:29:00.000Z

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