Timestamp microservie last 2 case is failing

Tell us what’s happening:
Describe your issue in detail here.
empty date constraint is failing

Your project link(s)

solution: https://vishvtimestamp.herokuapp.com

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Challenge: Timestamp Microservice

Link to the challenge:

Your code is passing for me.

When asking for help, please post your code. Or a link to your repo, or a Replit.

app.get("/api/:date?",(req,res)=>{
var da=req.params.date;
let d;
if(!da){
d=new Date();
}

else{
d=new Date(da);
if(isNaN(d)){
d=new Date(parseInt(da))
}
}

if(isNaN(d)){
res.json({
error : “Invalid Date”
})
}

else{
res.json({
unix:d.getTime(),
utc:d.toUTCString()
});
}}
)

for me empty parameter case is passing on localhost but not on public url