# Used to cache-bust locally
def manifest_time
t = Time.now
year = t.year
month = t.month
day = t.day
hour = t.hour
min = t.min
# Seconds changes too frequently for
# manifest, so HH:MM:00 or HH:MM:30.
sec = t.sec > 30 ? 0 : 30
# Outputs this format... 2013-03-27 12:11:00 UTC
return Time.utc(year, month, day, hour, min, sec)
end