IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [83504cf]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [26a467e]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [80fbc51]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [d543d82]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [90dc564]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [de1c18e]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [c6de3d3]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [feb56aa]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [ba061e4]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [115eed8]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [4184540]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [5660dc6]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [fcdf7fa]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [2c68dc8]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [d9fa7cf]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [162e316]
IzendaPeterCho July 28, 2015:  Updated How to use datediff (markdown) [40238a7]
IzendaPeterCho July 28, 2015:  Created How to use datediff (markdown) [764e6a5]