HOUR OF NEED

HOUR OF NEED. Meaning: A time when someone really needs something, almost a final chance.
Example: “I was there for him in his hour of need, but he hasn’t shown any sign of offering to help me now that I need his support!”
source: @EnglishTips4U

IN HOUR OF NEED. Meaning: At a time when someone needs help very
Example: “I shall never forget that they were the people who helped me in my hour of need.
source: http://idioms.thefreedictionary.com/in+hour+of+need
HOUR OF NEED. Meaning: A time when someone really needs something, almost a last chance, is their hour of need.
source: http://www.usingenglish.com/reference/idioms/hour+of+need.html