1string(TIMESTAMP timestamp "[%Y-%m-%d %H:%M:%S] %s" UTC) 2 3string(TIMESTAMP unix_time "%s") 4 5string(TIMESTAMP year "%Y" UTC) 6string(TIMESTAMP days "%j" UTC) 7 8# Doing proper date calculations here to verify unix timestamps 9# could be error prone. 10# At the very least use some safe lower and upper bounds to 11# see if we are somewhere in the right region. 12 13math(EXPR years_since_epoch "${year} - 1970") 14math(EXPR lower_bound "((${years_since_epoch} * 365) + ${days} - 1) * 86400") 15math(EXPR upper_bound "((${years_since_epoch} * 366) + ${days}) * 86400") 16 17 18if(unix_time GREATER_EQUAL lower_bound AND unix_time LESS upper_bound) 19 message("~${unix_time}~") 20else() 21 message(FATAL_ERROR "${timestamp} unix time not in expected range [${lower_bound}, ${upper_bound})") 22endif() 23