January 1, 2017 is a Sunday
- It is day number 1 of the year, 364 days left.
- It is Sunday number 1 out of 53 in 2017.
- It is Sunday number 1 out of 5 in January 2017.
- Year 2017 has 365 days.
- January 2017 has 31 days.
Time & Date Calculator App for iOS
See how long remains before a deadline or exactly when those 30 days are up.
Date Calculator API
Find a specific business date and calculate the working days in a given period.
- Doomsday Calculator – Calculate the weekday of any date in your Head
- Week Number Calculator – Find the week number for any date
- Date Calculator – Add or subtract days, months, years
- Add to or subtract from a date and time
- Duration Between Two Dates – Calculates number of days.
- Time and Date Duration – Calculate duration, with both date and time included
- Birthday Calculator – Find when you are 1 billion seconds old