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6727270b75
The new `%s` format specifier is substituted by file()/string() `TIMESTAMP` sub-commands with the number of seconds since unix-epoch (1970-01-01 00:00:00 UTC). Co-Author: Nils Gladitz <nilsgladitz@gmail.com>
23 lines
760 B
CMake
23 lines
760 B
CMake
string(TIMESTAMP timestamp "[%Y-%m-%d %H:%M:%S] %s" UTC)
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string(TIMESTAMP unix_time "%s")
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string(TIMESTAMP year "%Y" UTC)
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string(TIMESTAMP days "%j" UTC)
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# Doing proper date calculations here to verify unix timestamps
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# could be error prone.
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# At the very least use some safe lower and upper bounds to
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# see if we are somewhere in the right region.
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math(EXPR years_since_epoch "${year} - 1970")
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math(EXPR lower_bound "((${years_since_epoch} * 365) + ${days}) * 86400")
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math(EXPR upper_bound "((${years_since_epoch} * 366) + ${days}) * 86400")
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if(unix_time GREATER lower_bound AND unix_time LESS upper_bound)
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message("~${unix_time}~")
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else()
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message(FATAL_ERROR "${timestamp} unix time not in expected range [${lower_bound}, ${upper_bound}]")
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endif()
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