I use Class::Date for date comparisons. It facilitate comparisons with past, present and future dates.
use Class::Date qw/ date localdate now /;
# date that the billing period starts (get data from db)
my $period_start = date('2001-12-31');
# date to start attempting charges (get data from db)
my $charge_date = date('2001-12-27');
my $today = date( localdate( now ))->truncate; # truncate makes time m
+idnight
# it's late
if ( $charge_date < $today ){
print "Charge date passed. Transaction previously failed. Try aga
+in.\n";
}
# not yet due
elsif ( $charge_date > $today ) {
print 'Charge to be processed in ',
+( $charge_date - Class::Date->new( $today ) )->day,
' days.';
}
# charge today
else {
print 'Today is charge date. If successful, next charge date will
+ be: ',
date( $charge_date + '1M'); # one month
# change next charge date in BillSchedule table.
}
An alternative is to use Date::Calc, which was discussed recently here. Depending on how many comparisions you'll be doing, Date::Calc may be the best choice because it's much faster.