esp-idf/components/esp_bootloader_format/Kconfig.bootloader

menu "Bootloader manager"

    config BOOTLOADER_COMPILE_TIME_DATE
        bool "Use time/date stamp for bootloader"
        default y
        depends on !APP_REPRODUCIBLE_BUILD
        help
            If set, then the bootloader will be built with the current time/date stamp.
            It is stored in the bootloader description
            structure. If not set, time/date stamp will be excluded from bootloader image.
            This can be useful for getting the
            same binary image files made from the same source, but at different times.

    config BOOTLOADER_PROJECT_VER
        int "Project version"
        default 1
        range 0 4294967295
        help
            Project version. It is placed in "version" field of the esp_bootloader_desc structure.
            The type of this field is "uint32_t".
endmenu # "Bootloader manager"