A military time value of 1850 refers to 6:50 p.m. using a standard 12-hour clock. Military time operates on a 24-hour clock been 0000 and 2359.
According to Unitarium, military time uses the form "hhmm." The "hh" refers to the hour of the day between 00 and 23, and the "mm" refers to the minutes of the hour between 00 and 59. It is similar to using a 12-hour civilian clock, except values in the afternoon and evening uses hours between 13 and 23 inclusive rather than using the terms a.m. and p.m. One can easily derive civilian 12-hour time from military time. The "mm" in military time maps to the same minutes of the hour in a 12-hour clock. If the hour, "hh," in military time is 00, then the hour is midnight in civilian time. Hours between 01 and 11 in military time represent 1 a.m. to 11 a.m. in civilian time. An hour of 12 refers to noon. Hours between 13 to 23 in military time represent 1 p.m. through 11 p.m. in civilian time. If the hour in military time is 13 or higher, one can subtract 12 from this number to determine the p.m. hour in civilian time.