function convertTime(value, fromUnit, toUnit)
	{
	    if(fromUnit != toUnit && value !== 0)
	    {
	        return value * (toUnit == 's'? 0.001 : 1000);
	    }
	    return value;
	}
convert time from seconds to milliseconds and vice versa

@param {number} value
@param {string} fromUnit - 's' | 'ms'
@param {string} toUnit - 's' | 'ms'
@returns {Number}