使用Javascript将mysql UTC_TIMESTAMP转换为CST和MST

Question

I've done endless searching but cannot find a solution that works for me. I am storing records in a mysql database that logs the UTC time it was created (UTC_TIMESTAMP()). I need to present the data to the user (using JavaScript) in their local time. I've tried the following and it is not working:

JavaScript:

function localizeDateStr(dateToConvert,divId){
    newDate = new Date(dateToConvert);
    document.getElementById(divId).innerHTML = newDate.toString();
}

HTML:

<div id="<?php echo $divId ?>" class="td-short"></div>
<script type="text/javascript">window.onload = localizeDateStr('<?php echo $entryTime;?>','<?php echo $divId;?>');</script>

The UTC date that is stored in the db is the same date that is being displayed.I am not seeing a converted date. Any help would be appreciated. Please advise.

Answer 1

Parsing a string through the Date constructor (or through Date.parse ) is very sensitive to the format of the input string. With the value you gave in comments '2019-03-20 17:43:53' , most implementations will interpret this in terms of local time . However, the specification does not require conformance of that, as it only describes a very particular format. Anything else is implementation dependent.

Assuming your strings are consistently in this format, and you want it interpreted as UTC, your options are:

• Adjust the string to include a T separator between date and time parts, and end with Z to indicate UTC.

   var newDate = new Date(dateToConvert.replace(' ','T') + 'Z'); 

• Parse the string yourself:

   var parts = dateToConvert.split(/[-: ]/g).map((x) => parseInt(x)); parts[1]--; // Months are 0-11, so adjust var newDate = new Date(Date.UTC(...parts)); 

• Use a library like Luxon :

   var dt = luxon.DateTime.fromFormat(dateToConvert, 'yyyy-MM-dd HH:mm:ss', { zone: 'UTC' }); var newDate = dt.toJSDate(); 

  or Moment :

   var newDate = moment.utc(dateToConvert).toDate();