How to add ":" to xls filename after download using angular - ":" gets replaced by "_"

I have the angular code below to download xls file from API response, I am trying to change the file name to filenameDD_HH:MM . For some reason, the ":" is replaced with "" after download. Tried regex to replace ":" with "" , doesnt work as well.

downloadFile() {
this.servcie.downloadReport().subscribe({
nextresponse)=>{
const blob = new Blob([response], {type: 'application/octet-stream'});
const url = window.URL.createObjectURL(blob);
const anchor = document.createElement('a');
anchor.href=url;
var today = new Date();
let hours = today.getHours() + ":";
let minuted = today.getMinutes() + ":";
anchor.download = "myfile_" + hours + minutes + ".xls";
anchor.click();
window.URL.revokeObjectURL(url);
}
})

}

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