I got it in a different method (easier one);
I transformed the date/time value of the customField into a Calendar Object and I used the method getTimeZone from that object like this:
Calendar calendarOfDateTimeCustomField = new GregorianCalendar(Integer.valueOf(year),Integer.valueOf(month)-1,Integer.valueOf(day),Integer.valueOf(hour),Integer.valueOf(minute),Integer.valueOf(second));
log.debug("currentServer TimeZone: " + calendarOfDateTimeCustomField.getTimeZone().getRawOffset());
Thanks Alexey for the feedback, well noted, however, I didn't comment it here because I'm just explaining the method that i used instead of getting the timezone of the server (just to inform you that I didn't have the chance to try the method in the link above and get back to you with the result).
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