What are the trading hours for bonds?

By default, all orders are set to work only during Regular Trading Hours (RTH).

Generally "RTH" refers to the primary trading session for a particular exchange or region (e.g. US equity markets RTH are from 09:30 to 16:00 ET)…

The term Regular Trading Hours (RTH) is generally used to refer to the primary trading session for a particular exchange or region. For example, in the case of US equity markets, the RTH are from 09:30 to 16:00 ET. This designation is relevant as many exchanges offer pre- and post-market trading sessions which are referred to as extended trading hours or trading outside of RTH…

There are two reasons why an order would be filled during the pre-market session:

1. The submitted order was set to work outside regular trading hours (RTH) or pre-market hours.
2. The order was for an OTC/Penny stock which does not have a pre-market session but starts regular trading hours at 8:00 EST…

A bond’s day count convention is used to determine the number of days and calculate the amount of accrued interest due between a bond’s coupon payment dates.   

US Corporate Bonds often use a 30/360 day count while US Treasuries generally use Actual/Actual, however, this can vary and investors should consult the bond’s prospectus or contact the issuer to confirm the specific method being used for a particular bond…