end {
  print strpntime("1970-01-01T00:00:00Z", "%Y-%m-%dT%H:%M:%SZ");
  print strpntime("1970-01-01T00:00:00Z", "%Y-%m-%dT%H:%M:%SZ");
  print strpntime("1970-01-01 00:00:00 -0400", "%Y-%m-%d %H:%M:%S %z");
  print strpntime("1970-01-01%00:00:00Z", "%Y-%m-%d%%%H:%M:%SZ");
  print strpntime("1970-01-01T00:00:00Z", "%FT%TZ");
  print strpntime("1970:363", "%Y:%j");
  print strpntime("1970-01-01 10:20:30 PM", "%F %r");
  print strpntime("01/02/70 14:20", "%D %R");
  print strpntime("01/02/70 14:20", "%D %X"); # no such format code
  print fmtnum(strpntime("1971-01-01T00:00:00.123456Z", "%Y-%m-%dT%H:%M:%S.%fZ"), "%.6f");
}
