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For {{after}}: If parameter 1 is after parameter 2, returns 1, else nothing.
{{After|1860|10 April 1962}}
=
{{After|20 July 1969|10 April 1962}}
= 1
For {{before}}: the reverse.
{{Before|1860|10 April 1962}}
= 1
{{Before|20 July 1969|10 April 1962}}
=