Reports days, hours, minutes until a date. The counter does not change while they watch, but it changes every time it is shown. The embed sequence can be formatted with the usual font and boldness.
Example: " {hd time-until 12/25/2015} until Christmas." becomes "43 days and 16 hours until Christmas."
The first argument is a date and time, but it cannot contain spaces. You can use 'T' to mark the time. Example: '12/25/2015T8am'
The second argument is the format and defaults to 'dh'.
d -- show days, but will not show 0
h -- show hours
H -- show hours only when there is less than a day
m -- show minutes
M show minutes only when there is less than an hour
So dh shows days and hours, dH shows just days, then just hours