Fix: replace mktime() by dol_now()

htdocs/accountancy/class/accountancysystem.class.php

htdocs/adherents/card_subscriptions.php

htdocs/adherents/class/adherent.class.php

htdocs/adherents/class/cotisation.class.php

htdocs/adherents/htpasswd.php

htdocs/adherents/type.php

htdocs/boutique/index.php

htdocs/boutique/promotion/class/promotion.class.php

htdocs/comm/index.php

htdocs/comm/mailing/class/mailing.class.php

htdocs/comm/propal/class/propal.class.php

htdocs/compta/bank/rappro.php

htdocs/compta/facture/class/facture-rec.class.php

htdocs/compta/facture/class/facture.class.php

htdocs/compta/facture/impayees.php

htdocs/compta/index.php

htdocs/compta/prelevement/class/bon-prelevement.class.php

htdocs/compta/prelevement/class/rejet-prelevement.class.php

htdocs/compta/stats/index.php

htdocs/contrat/class/contrat.class.php