Blockchain timestamps are only accurate +/- 2 hours and may be out-of-order. If you care about what day your money goes into do not donate near the boundary.
The time used is the block timestamp, which is selected by the miner.
My attempt at Google translation:
Blockchain时间戳是唯一正确的+/ - 2小时,可能是出于序。如果你关心什么日子你的钱进入不边界附近捐赠。
所用的时间是块时间戳,这是由选定的矿工。