[kazinator]

With the TXR language:

  @(collect)
  @year-@month-@{day}T@hh:@mm:@ss-@tzh:@tzm
  @(end)
  @(output)
  @  (repeat)
  @hh:@mm on @month-@day
  @  (end)
  @(end)

Or:

  @(repeat)
  @year-@month-@{day}T@hh:@mm:@ss-@tzh:@tzm
  @(do
     (put-line `@hh:@mm on @month-@day`))
  @(end)

On the command line:

  $ txr -c '@(repeat)
  blah
  ...
  @(end)' - # dash for stdin or file name

From a file:

  $ txr script.txr file

I see we have a mistake in the handling of time zones; the minus sign is part of the time zone offset. Perhaps a small dash of regex, maybe:

  @year-@month-@{day}T@hh:@mm:@ss@{tzh /[+-]\d\d/}:@tzm