#!/home/bfiedler/anaconda3/bin/python3
# v0.3 7 September 2016 
# I runs this as a cron scipt:
# 05 * * * * /home/bfiedler/play/grib/todaygrab.py  >/home/bfiedler/cronscripts/cron.out 2>/home/bfiedler/cronscripts/cron.err
import sys,os
#from datetime import datetime, timedelta
import time
#datetime=time.strftime('%Y%m%d') # uses default localtime, for alt ftp site with delay
delay = 6 
t = time.time() -delay*3600
gt = time.gmtime(t)
datetime=time.strftime('%Y%m%d',gt) # assumes 0Z forecast is available at 0Z
itime = time.gmtime(t).tm_hour
#hh='00'
#if time.localtime().tm_hour>11: hh='12' # this works for big delays, like the alt ftp site
#if time.gmtime().tm_hour>11: hh='12' #  optimistic expectation that 12Z is avaiable at 12 Z 
#itime -=3 # in case crash recovery
itimex = (itime//6)*6
hh = '%02d' % itimex
datetimehh = datetime+hh
#datetimehh = datetime+'12' # to force time 
command = '/home/bfiedler/play/grib/gribgrab.py '+datetimehh
print(command)
os.system(command)