These are the allowed parameters for formatting on timeapi.org

    In the url, the '%' character is substituted as % and the space is %20

    %a - The abbreviated weekday name (“Sun”)
    %A - The full weekday name (“Sunday”)
    %b - The abbreviated month name (“Jan”)
    %B - The full month name (“January”)
    %c - The preferred local date and time representation
    %d - Day of the month (01..31)
    %H - Hour of the day, 24-hour clock (00..23)
    %I - Hour of the day, 12-hour clock (01..12)
    %j - Day of the year (001..366)
    %m - Month of the year (01..12)
    %M - Minute of the hour (00..59)
    %p - Meridian indicator (“AM” or “PM”)
    %S - Second of the minute (00..60)
    %U - Week number of the current year,
         starting with the first Sunday as the first day
         of the first week (00..53)
    %W - Week number of the current year,
         starting with the first Monday as the first day
         of the first week (00..53)
    %w - Day of the week (Sunday is 0, 0..6)
    %x - Preferred representation for the date alone, no time
    %X - Preferred representation for the time alone, no date
    %y - Year without a century (00..99)
    %Y - Year with century
    %Z - Time zone name
    %% - Literal “%” character