espocrm-base/application/Espo/Resources/metadata/app/emailTemplate.json

{
    "placeholders": {
        "today": {
            "className": "Espo\\Tools\\EmailTemplate\\Placeholders\\Today",
            "order": 0
        },
        "now": {
            "className": "Espo\\Tools\\EmailTemplate\\Placeholders\\Now",
            "order": 1
        },
        "currentYear": {
            "className": "Espo\\Tools\\EmailTemplate\\Placeholders\\CurrentYear",
            "order": 2
        }
    }
}