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set(STAMP_FILENAME "${CMAKE_CURRENT_BINARY_DIR}/FileTimestamp-Stamp")
set(STAMP_FORMAT "%Y-%m-%d")
unset(ENV{SOURCE_DATE_EPOCH})
string(TIMESTAMP timestamp1 "${STAMP_FORMAT}")
file(WRITE "${STAMP_FILENAME}" "foo")
file(TIMESTAMP "${STAMP_FILENAME}" timestamp2 "${STAMP_FORMAT}")
string(TIMESTAMP timestamp3 "${STAMP_FORMAT}")
message(STATUS "timestamp1 [${timestamp1}]")
message(STATUS "timestamp2 [${timestamp2}]")
message(STATUS "timestamp3 [${timestamp3}]")
if(timestamp1 STREQUAL timestamp3)
if(NOT timestamp1 STREQUAL timestamp2)
message(FATAL_ERROR
"timestamp mismatch [${timestamp1}] != [${timestamp2}]")
else()
message("all timestamps match")
endif()
else()
message(WARNING "this test may race when run at midnight")
endif()
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