The way to know the gas-cylinder expiration date!
We use gas cylinders in most of the households. 
Villages which do not have sufficient access to the gas, are used more in those villages.
It is often heard that people have died due to a cylinder explosion. But many people do not know why the cylinder explodes.
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All things like cylinders have expired dates. When the expiry ends, the cylinders advance towards the blast.
Keeping the expired cylinders in the house and having a bomb in the house are the same.
Source
How to know the cylinders expired date: The black-colored text displayed in the picture can be seen.
This is expiry date or expiration date.
Here it is written with the letters A, B, C, D
Source
A = First three months of the year January, February, March
B = The next three months in April, May, June.
C = The next three months of July, August, September.
D = Last three months of the year October, November, December. And at the end of the last two digits of the year, that is C18 (2018). If you have D19, your cylinder expires in October, 2019, November, December.
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