offsetFromGMT

The offsetFromGMT property is a JavaScript Date object method that returns the difference, in minutes, between the local time and Greenwich Mean Time (GMT). This value is always positive for time zones west of GMT and negative for time zones east of GMT. For example, if the local time is 5 hours ahead of GMT, offsetFromGMT will return -300 (5 * 60). Conversely, if the local time is 8 hours behind GMT, offsetFromGMT will return 480 (8 * 60).

This property is useful for performing time zone conversions or calculations. It can be used in conjunction with other Date object methods like getHours() and getMinutes() to determine the actual GMT time. However, it's important to note that offsetFromGMT does not account for Daylight Saving Time. Therefore, for accurate time zone calculations, especially those involving dates that might cross a Daylight Saving Time boundary, it is recommended to use more robust libraries that handle these complexities. The output of offsetFromGMT can vary depending on the user's system settings, as it reflects the local time zone configured on the machine running the JavaScript code.