Unix timestamp comparisons

How do we compare various timestamp in a C program on Unix?

I have to write a pgm which will check a ctime of a file and if it is < the machine boot time, the file will be removed. I am using getutxid to get the BOOT_TIME and stat() for the file ctime. It seems the timestamps returned against these two are in different format. What is the common format and how to convert so that logical comparisons are possible? Such as:

if (ctime < boottime)

and etc.

Copyright Notice：Content Author:「user2187316」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/15504677/unix-timestamp-comparisons

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