console.log timestamps in Chrome?

I originally added this as a comment, but I wanted to add a screenshot as at least one person could not find the option (or maybe it was not available in their particular version for some reason).

On Chrome 68.0.3440.106 (and now checked in 72.0.3626.121) I had to

• open dev tools (F12)
• click the three-dot menu in the top right
• click settings
• select Preferences in the left menu
• check show timestamps in the Console section of the settings screen

Update as of for Chrome 98:

Settings -> Preferences -> Console -> Show timestamps

From Chrome 68:

"Show timestamps" moved to settings

The Show timestamps checkbox previously in Console Settings Console Settings has moved to Settings.

ES6 solution:

const timestamp = () => `[${new Date().toUTCString()}]`
const log = (...args) => console.log(timestamp(), ...args)

where timestamp() returns actually formatted timestamp and log add a timestamp and propagates all own arguments to console.log

Chrome Version 89.0.4389.90 (19.03.2021)

1. Press F12.
2. Find and press gear wheel icon.
   
3. Check Show timestamps.
   

extended the very nice solution "with format string" from JSmyth to also support

• all the other console.log variations (log,debug,info,warn,error)
• including timestamp string flexibility param (e.g. 09:05:11.518 vs. 2018-06-13T09:05:11.518Z)
• including fallback in case console or its functions do not exist in browsers

.

var Utl = {

consoleFallback : function() {

    if (console == undefined) {
        console = {
            log : function() {},
            debug : function() {},
            info : function() {},
            warn : function() {},
            error : function() {}
        };
    }
    if (console.debug == undefined) { // IE workaround
        console.debug = function() {
            console.info( 'DEBUG: ', arguments );
        }
    }
},


/** based on timestamp logging: from: https://stackoverflow.com/a/13278323/1915920 */
consoleWithTimestamps : function( getDateFunc = function(){ return new Date().toJSON() } ) {

    console.logCopy = console.log.bind(console)
    console.log = function() {
        var timestamp = getDateFunc()
        if (arguments.length) {
            var args = Array.prototype.slice.call(arguments, 0)
            if (typeof arguments[0] === "string") {
                args[0] = "%o: " + arguments[0]
                args.splice(1, 0, timestamp)
                this.logCopy.apply(this, args)
            } else this.logCopy(timestamp, args)
        }
    }
    console.debugCopy = console.debug.bind(console)
    console.debug = function() {
        var timestamp = getDateFunc()
        if (arguments.length) {
            var args = Array.prototype.slice.call(arguments, 0)
            if (typeof arguments[0] === "string") {
                args[0] = "%o: " + arguments[0]
                args.splice(1, 0, timestamp)
                this.debugCopy.apply(this, args)
            } else this.debugCopy(timestamp, args)
        }
    }
    console.infoCopy = console.info.bind(console)
    console.info = function() {
        var timestamp = getDateFunc()
        if (arguments.length) {
            var args = Array.prototype.slice.call(arguments, 0)
            if (typeof arguments[0] === "string") {
                args[0] = "%o: " + arguments[0]
                args.splice(1, 0, timestamp)
                this.infoCopy.apply(this, args)
            } else this.infoCopy(timestamp, args)
        }
    }
    console.warnCopy = console.warn.bind(console)
    console.warn = function() {
        var timestamp = getDateFunc()
        if (arguments.length) {
            var args = Array.prototype.slice.call(arguments, 0)
            if (typeof arguments[0] === "string") {
                args[0] = "%o: " + arguments[0]
                args.splice(1, 0, timestamp)
                this.warnCopy.apply(this, args)
            } else this.warnCopy(timestamp, args)
        }
    }
    console.errorCopy = console.error.bind(console)
    console.error = function() {
        var timestamp = getDateFunc()
        if (arguments.length) {
            var args = Array.prototype.slice.call(arguments, 0)
            if (typeof arguments[0] === "string") {
                args[0] = "%o: " + arguments[0]
                args.splice(1, 0, timestamp)
                this.errorCopy.apply(this, args)
            } else this.errorCopy(timestamp, args)
        }
    }
}
}  // Utl

Utl.consoleFallback()
//Utl.consoleWithTimestamps()  // defaults to e.g. '2018-06-13T09:05:11.518Z'
Utl.consoleWithTimestamps( function(){ return new Date().toJSON().replace( /^.+T(.+)Z.*$/, '$1' ) } )  // e.g. '09:05:11.518'