javascript - toISOString() return the wrong data at first april - Stack Overflow

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I use the method toISOString() to convert a date into a ISO String

 console.log(date);
 var x = date.toISOString();
 console.log(x);

My input date-object contains the following data Wed Apr 01 2020 01:00:00 GMT+0200 (Mitteleuropäische Sommerzeit)

The output of toISOString() is 2020-03-31T23:00:00.000Z

I try to find a solution and explaination about this strange result, because it happens only by the 1st of April - and this is not an april joke. Does somebody can explain the behavior? Or can give me a hint, how I can get the correct value?

I use the method toISOString() to convert a date into a ISO String

 console.log(date);
 var x = date.toISOString();
 console.log(x);

My input date-object contains the following data Wed Apr 01 2020 01:00:00 GMT+0200 (Mitteleuropäische Sommerzeit)

The output of toISOString() is 2020-03-31T23:00:00.000Z

I try to find a solution and explaination about this strange result, because it happens only by the 1st of April - and this is not an april joke. Does somebody can explain the behavior? Or can give me a hint, how I can get the correct value?

• javascript

Share Improve this question Follow asked Feb 28, 2018 at 14:28 michael-mammutmichael-mammut 2,80355 gold badges3131 silver badges4949 bronze badges 6

• How is Date set? – epascarello Commented Feb 28, 2018 at 14:30
• 2 Different timezones, but the date is the same. – Federico klez Culloca Commented Feb 28, 2018 at 14:31
• So what's the problem? The ISO string is in UTC while your input date is in GMT+2. They are the same date. – Derek 朕會功夫 Commented Feb 28, 2018 at 14:31
• There is no problem, both represent exactly the same instant in time, just with different offsets to UTC – phuzi Commented Feb 28, 2018 at 14:32
• 1 “because it happens only by the 1st of April - and this is not an april joke. Does somebody can explain the behavior?” - you might want to go check when DST ends in 2020 ... – C3roe Commented Feb 28, 2018 at 14:32

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1 Answer 1

Sorted by: Reset to default 9

Simple. Your timezone is +0200 GMT, and toISOString() gives you Zulu time. Everything is correct here.

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