There isn;t any downloadable manuals for Rolex watches, but operation of Rolex Day-Date is very simple:
1) when you unscrew the crown, it is in winding position,
2) when you pull out the crown to the first click, it is in day and date setting position (depending wich way you turn the crown).
NOTE: to adjust the day or date, previously you have to advance hands forward, passing 12 o'clock (midnight) mark and stop advancing at 4.00 a.m. using the crown in position as described in chapter 3. When done - push the crown fully in, then pull out to the first click and only then adjust the day or date.
3) when you pull the crown further out to the second click, it is in time setting position.
To find the daytime or night time on the watch: pull out crown to the second click and advance watch hands forward till you pass the 12 mark on dial. If the date changes as you pass it - it is the night time (midnight). If the date do not change as you pass it - it is the daytime (noon).
After all settings being done, allways screw the crown back down as it protects the watch from water and moisture.
Never use watch in sauna- it's not designed for that.
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