Write a date and/or time string, from a given date (or the current date/time of no special date is given) and a format string.
Could be useful for generated documents that need a date.
A date format string, like the one accepted by the strftime C function.
Optional, by default takes the current time. It could be an Unix timestamp, or a parseable string.
Print the current date
<<date | %Y-%m-%d>>
Print the date corresponding to a given timestamp
<<date | %Y-%m-%d | 1358709717>>
Very good idea !