The [date], [time], and [uptime] data sources can optionally take a format
as a parameter. The following character sequences will be interpreted in
the format (anything else is included verbatim):

m month (1-12)
mm month with leading zero (01-12)
mmm abbreviated month name (Jan, Feb, etc)
mmmm full month name (January, February, etc)
d day (1-31)
dd day with leading zero (01-31)
ddd abbreviated weekday name (Sun, Mon, etc)
dddd full weekday name (Sunday, Monday, etc)
yy 2-digit year
yyyy 4-digit year
h hour (1-12)
hh hour with leading zero (01-12)
i hour (0-23)
ii hour with leading zero (00-23)
n minute (0-59)
nn minute with leading zero (00-59)
s second (0-59)
ss second with leading zero (00-59)
am/pm am/pm indicator