I have included ntp package.
When yocto OS image comes out, it has only ntp, there is no ntpdate.
I found someone has the same problem but no solution:
https://forums.xilinx.com/t5/Embedded-Linux/How-to-install-ntpdate-command/td-p/1052770
Why it has only ntp? The recipe did include ntpdate.
ex:
install -m 755 ${WORKDIR}/ntpdate ${D}${bindir}/ntpdate-sync
...
install -m 0644 ${WORKDIR}/ntpdate.service ${D}${systemd_unitdir}/system/
ntp and ntpdate are two packages of the ntp recipe.
If you want to add ntpdate, just add to your image:
IMAGE_INSTALL += "ntpdate"
Explanation:
Take a look at the recipe, and at the PACKAGES variable:
PACKAGES += "ntpdate sntp ${PN}-tickadj ${PN}-utils"
It means that the ntp recipe contains the packages: ntp (default ${PN}), ntpdate, sntp, ntp-tickadj, ntp-utils.
You can also take a look at the environment of the ntp recipe:
$ bitbake ntp -e |grep ^PACKAGES=
PACKAGES="ntp-src ntp-dbg ntp-staticdev ntp-dev ntp-doc ntp-locale ntp ntpdate sntp ntpq ntp-tickadj ntp-utils"