1 將系統(tǒng)時(shí)間轉(zhuǎn)換成unix時(shí)間戳
datetime dtstart = timezone.currenttimezone.tolocaltime(new datetime(1970,1,1));
datetime dtnow = datetime.parse(datetime.now.tostring());
timespan tonow = dtnow.subtract(dtstart);
string timestamp = tonow.ticks.tostring();
timestamp = timestamp.substring(0,timestamp.length - 7);
2將unix時(shí)間戳轉(zhuǎn)換成系統(tǒng)時(shí)間
string timestamp = "1144821796";
datetime dtstart = timezone.currenttimezone.tolocaltime(new datetime(1970,1,1));
long ltime = long.parse(timestamp + "0000000");
timespan tonow = new timespan(ltime);
datetime dtresult = dtstart.add(tonow);

//datetime轉(zhuǎn)變?yōu)閡nix時(shí)間，直接轉(zhuǎn)換，不改變時(shí)區(qū)
datetime dtstart = new datetime(1970, 1, 1, 0, 0, 0);
timespan tonow = dt.subtract(dtstart);
int timestamp = (int)(tonow.ticks/10000000);