Merge "Partially revert BUILD_DATETIME change"

  BUILD_ID := UNKNOWN

endif

ifndef BUILD_DATETIME

  # Used to reproduce builds by setting the same time. Must be the number

  # of seconds since the Epoch.

  BUILD_DATETIME := $(shell date +%s)

endif

ifneq (,$(findstring Darwin,$(UNAME)))

DATE := date -r $(shell cat $(BUILD_DATETIME_FILE))

DATE := date -r $(BUILD_DATETIME)

else

DATE := date -d @$(shell cat $(BUILD_DATETIME_FILE))

DATE := date -d @$(BUILD_DATETIME)

endif

# Everything should be using BUILD_DATETIME_FROM_FILE instead.

# BUILD_DATETIME and DATE can be removed once BUILD_NUMBER moves

# to soong_ui.

BUILD_DATETIME :=

ifndef BUILD_NUMBER

  # BUILD_NUMBER should be set to the source control value that

  # represents the current state of the source code.  E.g., a