Calculate unix timestamps manaully from the epoch
Calculate unix timestamps manaully from the epoch

This is needed since the Python 2.7 time library does not support years
< 1900 (see https://docs.python.org/2.7/library/time.html)

ogdch/ckanext-geocat,opendata-swiss/ckanext-geocat,opendata-swiss/ckanext-geocat,ogdch/ckanext-geocat