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#!/usr/bin/env python
"""
Increment the hour in a datetime string, wrapping round within any given range.
"""
import sys
try:
dt_str = sys.argv[1]
first, last = (sys.argv[2:4] + [None, None])[:2]
except (IndexError, ValueError):
sys.exit(1)
if not dt_str:
sys.exit(1)
try:
date_str = dt_str[:9]
hour = int(dt_str[9:11])
min_sec_str = dt_str[11:]
except ValueError:
sys.exit(1)
if not first:
first = 0
else:
first = int(first)
if not last:
last = 23
else:
last = int(last)
hour += 1
if hour > last:
hour = first
print '%s%02d%s' % (date_str, hour, min_sec_str)
# vim: tabstop=4 expandtab shiftwidth=4
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