Please explain

what is the meaning of %02d and %04d ??

you understand what %d? The number simply indicate the number of decimals you want to display.

i dont understand what it s use in displaying date time year month etc

some times %04d is used and other time %02d how to get to know what to use when ?

the year is 2018, that is four digits which is why we use %04d, while the month is April, which is the 4th month (04), which we want to display with 2 digits.

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