This function generates a time stamp of the format 'yymmdd_hhmmss'.
This is a support function and is not intended for direct use.
See also
Other Support:
any_idate(),
camel_clean(),
check_inputs(),
cut_hour(),
extract_date_range(),
extract_hr(),
heat_colours(),
is_date_format(),
maxmin(),
pairwise_count(),
read_preamble(),
rgb2hex(),
totals_bind(),
totals_col(),
us_to_space(),
wrap()