of 174 respondents and acceptance of males in the nursing profession by multiple regression analysis has indicated that only two of the variables, namely, respondents' educational level and sex, significantly predict the attitudes toward male nurses (Laroche and Livneh, 1983).
I have always used by end of business which normally means by 5pm. I think that it depends on who you are sending the email to. If it is a superior you might want to reconsider and define an exact time deadline. If it is to a subordinate giving a general time frame like end of today or end of the day would be fine. share|improve this answer.
Most job postings have closing dates. This date is the deadline for applicants to turn in the job application and other required application materials as outlined in the job posting. The closing date is a milestone in the hiring process because all events before it build to it, and all events after are predicated on it passing.