Just got a gym membership and its open 24hrs when is the best time to workout i heard nights is when u lose more calories?

Does not matter: Generally when it comes to exercise what is the most important is to keep a regular workout schedule. Time of the day does not influence the amount of calories you burn which depends on activity type and intensity of the work out. If you are a night owl you will find gym less crowded in night. But start your routine when ever you can good luck.