I'm new to the developer role, please forgive me if I ask questions where the answers may seem obvious.

I'm using gulp-zip, which depends on yazl, and I'm including a modifiedTime option. I need to match the existing code that gulp-zip is replacing by setting the last-modified time to epoch 0. I'm finding that adding a modifiedTime option works fine so long as the time stamp is newer than "1980-01-01T24:00:00Z". If it's anything older, I get a far future date. For example, if I use 0 or "1970-01-01T00:00:00Z", I get a last modified of 1/1/2098.

It looks like the cause is in the dateToDosDateTime function that begins at line 624.

function dateToDosDateTime(jsDate) {
  var date = 0;
  date |= jsDate.getDate() & 0x1f; // 1-31
  date |= ((jsDate.getMonth() + 1) & 0xf) << 5; // 0-11, 1-12
  date |= ((jsDate.getFullYear() - 1980) & 0x7f) << 9; // 0-128, 1980-2108

Is using 1980 instead of 1970 a bug or intentional?