Dates, Durations

Date and durations help to deal with date related business logic.
Durations
A duration value may be defined with a combination of several duration units:
second with s
minute with m
hour with h
day with d
week with w
Duration values are integers, positive, or negative.
effect {
  var d1 = 4d;    // 4 days
  var d2 = 1w;    // 1 week
  var d3 = 2d10h; // 2 days and 10 hours
  var d4 = -5d;   // minus 5 days
} 
Durations values may be compared with the 6 comparison operators = < > <= >= <>. 
Two duration values may be added or subtracted. It is also possible to multiply a duration by an integer value.
effect {
  var d1 = 55w; // 55 weeks
  var d2 = 3d;  // 3 days
  var d3 = d1 + d2 // equal to '55w3d'
  var d2 = 10 * d3 // 555 weeks
}
Dates
Date format is ISO 8601. 
constant date0 : date = 2019-01-01                
constant date1 : date = 2019-01-01T01:02:03       
constant date2 : date = 2019-01-01T01:02:03Z      
constant date3 : date = 2019-01-01T00:00:00+01:00 
constant date4 : date = 2019-01-01T00:00:00-05:30 
The subtraction of two dates returns a duration; since the duration is a positive number, if d1 and d2 are two dates, then d1 - d2 = d2 - d2 >= 0 holds.
effect {
  var d1 := 2020-06-28;
  var d2 := 2020-05-28;
  if (d1 - d2 = 4w) then transfer 1tz to coder;
}
It is possible to add or subtract a duration to a date value to get a new date.
effect {
  var d1 := 2020-06-17;
  if (d1 + 5d = 2020-06-22) then transfer 1tz to coder;
}
Now
now is the keyword to refer to the date at execution.
variable deadline : date = 2020-09-01
​
action submit() {
  require {
    r1 : deadline - 8w <= now <= dealine + 1d
  }
  effect {
    ...
  }
 }
Strings
Numbers
Last updated 4 months ago