Simple Exif manipulation script

gistfile1.py

HOURS_DIFFERENCE = 9 # can be negative

import os
import time
import datetime
import pyexiv2

for fname in os.listdir('.'):
	if fname.lower().endswith('.jpg'):
		print fname

		fp = pyexiv2.ImageMetadata(fname)
		fp.read()

		for key in fp.exif_keys:
			if 'Date' not in key: continue

			tag = fp[key]

			if not isinstance(tag.value, datetime.datetime): continue

			tag.value = tag.value + datetime.timedelta(hours=HOURS_DIFFERENCE)

		fp.write()

raw_input('Job finished.')