Archive formats

ZIP DOS timestamp encoder

Encode calendar components into ZIP’s two-byte time and date fields.

Your inputs

Start with an example

Example result

Pack date and time bit fields. Seconds have two-second resolution and round down. Output stores the time word then date word, both little-endian.

1980-01-01 00:00:00 encodes as 00 00 21 00.

DOS fields contain no timezone. This does not convert UTC/local time or parse extended timestamp fields.