Rebol comes built-in with nice date & time features. While it doesn't have all the bells and whistles you would get with a 3rd party library like the one poste

Rebol comes built-in with nice date & time features. While it doesn't have all the bells and whistles you would get with a 3rd party library like the one posted here it does have an advantage that date & time are both first class datatypes: >> type? 6-Aug-2014 == date! >> type? 01:20:59 ; 1 hour, 20 mins and 59 secs == time! >> 6/8/2014 - 5/8/2014 == 1 >> difference 6/8/2014 5/8/2014 == 24:00 >> yesterday: now - 1 == 5-Aug-2014/13:12:33+1:00 >> yesterday/day == 5 >> one-hour-twenty-mins: 1:20 == 1:20 >> one-hour-twenty-mins/minute == 20 >> one-hour-twenty-mins/hour == 1 >> two-hours: one-hour-twenty-mins + 0:40 == 2:00 refs: http://www.rebol.com/r3/docs/datatypes/date.html http://www.rebol.com/r3/docs/datatypes/date.html | http://www.rebol.com/r3/docs/datatypes/time.html http://www.rebol.com/r3/docs/datatypes/time.html