whensunrise.py

#!/usr/bin/env python
  
import os, sys, time

# get tomorrow
tom = int(time.time()) + 86400;

# get target time
target = time.strftime("%Y%m%d_05:36:00", time.localtime(float(tom)))

# get epoch of target
pattern = '%Y%m%d_%H:%M:%S'
epoch = int(time.mktime(time.strptime(target, pattern)))

# get divergence of now and then
seconds = int(epoch) - int(time.time())

# get hours until sunrise
hours = seconds / 60 / 60

# print hours till sunrise
print hours,'hours till sunrise'