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string(TIMESTAMP timestamp "[%Y-%m-%d %H:%M:%S] %s" UTC)
string(TIMESTAMP unix_time "%s")
string(TIMESTAMP year "%Y" UTC)
string(TIMESTAMP days "%j" UTC)
# Doing proper date calculations here to verify unix timestamps
# could be error prone.
# At the very least use some safe lower and upper bounds to
# see if we are somewhere in the right region.
math(EXPR years_since_epoch "${year} - 1970")
math(EXPR lower_bound "((${years_since_epoch} * 365) + ${days}) * 86400")
math(EXPR upper_bound "((${years_since_epoch} * 366) + ${days}) * 86400")
if(unix_time GREATER lower_bound AND unix_time LESS upper_bound)
message("~${unix_time}~")
else()
message(FATAL_ERROR "${timestamp} unix time not in expected range [${lower_bound}, ${upper_bound}]")
endif()
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