Holiday('ANZAC Day', type='fixed', day=25, month=APR, sat_adj=0, sun_adj=0)
Holiday('Christmas Day', type='fixed', day=25, month=DEC, sat_adj=2, sun_adj=1)
Holiday('Boxing Day', type='fixed', day=26, month=DEC, sat_adj=2, sun_adj=2)
Detecting a US Holiday