.append('<span class="help-block">You have entered date periods that overlap, please check your dates and enter each period of time separately.</span>');
.append('<span class="help-block invalid-date">You have entered date periods that overlap, please check your dates and enter each period of time separately.</span>');
.append('<span class="help-block">You have entered an end date (To:) that is earlier than the start date (From:), please check your dates and try again.</span>');
.append('<span class="help-block invalid-date">You have entered an end date (To:) that is earlier than the start date (From:), please check your dates and try again.</span>');