The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.
One of a set of tools we're offering as a way of saying thank you for being a part of the community.
I wouldn't do it that way. This is what I use.
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Without a time, MySQL makes it 0 so it is actually using '2013-01-01 00:00:00'.