Why is the correct configuration of a system’s time zone important?

Why is the correct configuration of a system’s time zone important?
A . Because the timezone is included in checksum calculations and timezone changes invalidate existing checksums.
B . Because the time zone is saved as part of the modification times of files and cannot be changed after a file is created.
C . Because the environment variables LANG and LC_MESSAGES are, by default, set according to the time zone.
D . Because NTP chooses servers nearby based on the configured time zone.
E . Because the conversion of Unix timestamps to local time relies on the time zone configuration.

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Answer: E