from this day forth==from now on
1 From from this day forth==from now on you will see a new man work with you.(用一般将来时)
from that day forward
2 From that day forward she was longer seen anywhere in the neighbourhood.(一般过去时)
3 如果指过去到今天-------我们用since then------现在完成时
Since then we haven't seen her anywhere in this neighbourhood.
4 henceforth ------太书面化了,也太out of date了.