convert central time to gmt in javascript

To convert Central Time (CT) to Greenwich Mean Time (GMT) in JavaScript, you can use the built-in Date() constructor and methods along with the getTimezoneOffset() function.

Here's an example code snippet that converts the current time in CT to GMT:

index.tsx
// Get current date and time in Central Time
const ctDate = new Date();
const ctOffset = ctDate.getTimezoneOffset() / 60; // Divide by 60 to convert minutes to hours
const ctTime = ctDate.getTime() + (ctOffset * 60 * 60 * 1000); // Convert to milliseconds

// Convert CT time to GMT
const gmtDate = new Date(ctTime);
const gmtOffset = gmtDate.getTimezoneOffset() / 60; // Calculate GMT offset, negative because it's ahead of GMT
const gmtTime = ctTime - (gmtOffset * 60 * 60 * 1000); // Subtract GMT offset in milliseconds

// Format and display GMT time
const gmtDateString = new Date(gmtTime).toUTCString();
console.log(gmtDateString); // Example output: "Wed, 14 Jul 2021 20:42:25 GMT"
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In this code, we first get the current date and time in CT using new Date(). We then calculate the CT offset from GMT using getTimezoneOffset() and divide it by 60 to convert it from minutes to hours. We add this offset to the current time in milliseconds to get the CT time.

To convert this CT time to GMT, we create a new Date() object using the CT time in milliseconds. We then calculate the GMT offset in hours using getTimezoneOffset() and negate it because GMT is ahead of CT. Finally, we subtract the GMT offset in milliseconds from the CT time to get the GMT time in milliseconds.

We can then format the GMT time using toUTCString() and display it using console.log().