How to Convert a JavaScript Date to UTC
In this tutorial, you will read and learn useful information about the right way of converting a JavaScript Date to the Coordinated Universal Time standard.
Assume the user is in a timezone quite different from UTC, and the date range should be converted to UTC.
This can be done by using the JavaScript Date object. To convert a JavaScript date to UTC, you should use the toISOString() method:
JavaScript: Convert a Date to UTC
The <kbd class="highlighted">toISOString()</kbd> method returns a string that represents the given date in the ISO 8601 format according to universal time.
The <kbd class="highlighted">toISOString()</kbd> method returns a string in extended ISO format (ISO 8601). The timezone is zero UTC offset, as indicated by the suffix "Z". It does not take any parameters and is only used with a Date object. Note that toISOString() formats the timestamp as UTC but does not modify the underlying Date object's internal millisecond value.
Date Object
The JavaScript Date object represents a single instance in time in a platform-independent format. It contains a number that represents milliseconds since January 1, 1970, UTC. There are a number of methods that obtain a date in various formats, as well as to perform time zone conversions. There are also functions that output the date and time in UTC (Coordinated Universal Time), the global standard time defined by the World Time Standard.