Well, I added to my project this quick-fix task

[code]public class UpdateThemeDateTask extends AbstractTask {

    /**
     * @param taskName
     * @param taskDescription
     */
    public UpdateThemeDateTask() {

        super("Update themes date", "All css, JS and images files need new date 
for cache.");
    }

    /*
     * (non-Javadoc)
     * @see 
info.magnolia.module.delta.Task#execute(info.magnolia.module.InstallContext)
     */
    @Override
    public void execute(final InstallContext ctx)
        throws TaskExecutionException {

        final String themeName = getThemeName(ctx);

        try {
            final Node baseNode = 
ctx.getJCRSession("resources").getNode("/templating-kit/themes/" + themeName);
            updateDate(baseNode);
        } catch (final RepositoryException e) {
            ctx.error("Can't set new date", e);
        }

    }

    /**
     * @param node
     * @throws RepositoryException
     */
    private void updateDate(final Node node)
        throws RepositoryException {

        if (node.hasNodes()) {
            final Iterable<Node> nodes = NodeUtil.getNodes(node);

            for (final Node childNode : nodes) {
                updateDate(childNode);
            }
        }

        final MetaData metaData = MetaDataUtil.getMetaData(node);
        if (metaData.getCreationDate() == null) {
            metaData.setCreationDate();
        } else {
            metaData.setModificationDate();
        }

    }

    /**
     * 
     * @param ctx
     * @return
     */
    protected String getThemeName(final InstallContext ctx) {

        return ctx.getCurrentModuleDefinition().getProperty("themeName");
    }[/code]

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=da35a197-f050-421b-86aa-a71bbe68c28a

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