My python solution:

def timeInWords(h, m):

nums = ["one",'two','three','four','five','six','seven','eight','nine','ten','eleven','tweleve', 'thirteen', 'fourteen',15,'sixteen', 'seventeen', 'eighteen','nineteen','twenty','twenty one','twenty two','twenty three', 'twenty four','twenty five','twenty six','twenty seven','twenty eight', 'twenty nine']

phrases = {0:"o' clock", 
       15:"quarter past", 30:'half past', 
       45:"quarter to", }
if m==1 and h==1:
    return 'one minute past one'
if m==0:
    return nums[h-1]+' '+phrases[m]
elif m==45:
    return phrases[m]+' '+nums[h]
elif m==15:
    return phrases[m]+' '+nums[h-1]
elif m==30:
    return phrases[m]+' '+nums[h-1]
elif 1<=m<=30:
    return nums[m-1]+' minutes past '+ nums[h-1]
else:
    k=60-m
    return nums[k-1]+' minutes to '+nums[h]