Since I started working, I have gained 20kg.

I have odd working hours which makes me sometimes skip breakfast, lunch or dinner.

My work sometime require me to sit in datacenter with cold aircond, working late at night. Sometimes I forgot to drink plain water in a day.

What can I do to reduce my weight with such odd working hours?

60% diet, 40% exercise. If you dont check what you eat, even with some cardio, fat hardly gonna decrease. Calorie out > calorie in. So mind your calorie intakes. And do add resistance training, not cardio. More muscles = more afterburn.

Good idea. After awhile, I've realized too that I was doing alot of cardio instead of weight training. Now I'm doing less cardio, more weight and resistance training.

Never like jogging. hehe...

I just run on my threadmill. 

Just want to share how i get rid my excessive weight.

Before start exercise my bmi was 27 which is slightly obese. I know it was an alarm to bad health so i start working out.
I start with weight training only 3 times a week.

My weight did reduce but not much significant even after few months.

Later i change my training method, before i do my usual weight training, i do run on treadmill or elliptical machine for about 10 to 20mins. That exercises very effective where now i manage to have the bmi of 22. Still now i do 3 times a week only. Of course have to have 1 day rest so that i am not overdo myself.

Good luck dude in reducing weight.

Yeah correct.
Anything wrong with that?

Fuu after 3 km running do u still have stamina to lift weights?
Myself sometimes after 20mins running i only able to do 3 or 4 sets of lifting only.
What is ideal body fat composition?
If naik but still within acceptable range should be ok right?

19 is not that bad la...little bit more.
but 3km in 40-50mins is like walking pace...try up the intensity more to 3km in 30mins...then more...

3km you should do within 30-35 min. And that's for non-regular runners.

I thought got 5km 10km for newbie?
I wan my weight drop  to 70kg
Now 90kg.

We can improve our distance from 5km to 10km

Wow 1hour only
Nice

Jog only or run

You can be the same person at 100kg, but either be muscular or obese.

Difference is body fat %.

It's impossible for fats to convert into muscles.

No. Refer to slimey's reply.

One tissue cannot possibly convert to another.

Where did u hear of that actually because apparently this is a well known myth

Again, refer to Slimey's reply. Fats does NOT convert to Muscles.

Exercising helps to burn calories but any form of workout of exercise is pointless if you consume more calories than you burn. As a result, you will be gaining weight instead of losing.

The most effective way of burning fat is through your eating habits (caloric deficit) and working out helps quite a bit too.

I suggest you read the previous replies here carefully

i got tips to lose fat

if you live in flat or apartment, simply walk the stairs from bottom to top 2 times. do this when you wake up in empty stomach. no need to rush, just climb the stairs slowly.

in 2 weeks you will see result. i promise you. no need to sign up for gym or anything.