Date Time

Call from the right click menu. To mainly use this function, please refer to "To start date and time calculation alone".

Date+/-Time

Add or subtract the date specified in the upper row and the time specified in the lower row.

You can customize the result display by "Formatting" in the right-click menu. See below.

Date-Date

The time difference between the upper and lower date and time is displayed.

Time+/-Time

Displays the time when the lower time is added or subtracted in the upper row time.

Time calculation in the Main window
[DMS] and [Deg] keys.
For example, in 3 hours 59 minutes enter 3.59 and convert it to 3.983333333333333 hours with the [Deg] key.
The [DMS] key is the reverse.
The notation 12.34567 on the calculator will be 12 hours 34 minutes 56.7 seconds.
You can also assign it to any key in "Key customization".
There is a button to set the date and time to today's date, current time, 0: 00.
You can copy to the clipboard and input to MCalc with the button next to the calculation result (except those whose format is year, date, hour, minute, second). Also, since it is also on the right click menu, you
can operate keys via the right click key (application key).
Days may be different even for the same number of years depending on the period calculated due to leap year.
Due to limitations on the Windows side, the dates that can be input and output are in the range of approximately 1752 to 9999, and errors exceeding this range may occur.

Specifier	Displays
c	Displays the date using the format given by the ShortDateFormat global variable, followed by the time, using the format given by the LongTimeFormat global variable. The time is not displayed if the date-time value indicates midnight precisely.
d	Displays the day as a number without a leading zero (1-31).
dd	Displays the day as a number with a leading zero (01-31).
ddd	Displays the day as an abbreviation (Sun-Sat) using the strings given by the ShortDayNamesglobal variable.
dddd	Displays the day as a full name (Sunday-Saturday) using the strings given by the LongDayNames global variable.
ddddd	Displays the date using the format given by the ShortDateFormat global variable.
dddddd	Displays the date using the format given by the LongDateFormat global variable.
e	(Windows only) Displays the year in the current period/era as a number without a leading zero (Japanese, Korean, and Taiwanese locales only).
ee	(Windows only) Displays the year in the current period/era as a number with a leading zero (Japanese, Korean, and Taiwanese locales only).
g	(Windows only) Displays the period/era as an abbreviation (Japanese and Taiwanese locales only).
gg	(Windows only) Displays the period/era as a full name (Japanese and Taiwanese locales only).
m	Displays the month as a number without a leading zero (1-12). If the m specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.
mm	Displays the month as a number with a leading zero (01-12). If the mm specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.
mmm	Displays the month as an abbreviation (Jan-Dec) using the strings given by the ShortMonthNames global variable.
mmmm	Displays the month as a full name (January-December) using the strings given by the LongMonthNames global variable.
yy	Displays the year as a two-digit number (00-99).
yyyy	Displays the year as a four-digit number (0000-9999).
h	Displays the hour without a leading zero (0-23).
hh	Displays the hour with a leading zero (00-23).
n	Displays the minute without a leading zero (0-59).
nn	Displays the minute with a leading zero (00-59).
s	Displays the second without a leading zero (0-59).
ss	Displays the second with a leading zero (00-59).
z	Displays the millisecond without a leading zero (0-999).
zzz	Displays the millisecond with a leading zero (000-999).
t	Displays the time using the format given by the ShortTimeFormat global variable.
tt	Displays the time using the format given by the LongTimeFormat global variable.
am/pm	Uses the 12-hour clock for the preceding h or hh specifier, and displays 'am' for any hour before noon, and 'pm' for any hour after noon. The am/pm specifier can use lower, upper, or mixed case, and the result is displayed accordingly.
a/p	Uses the 12-hour clock for the preceding h or hh specifier, and displays 'a' for any hour before noon, and 'p' for any hour after noon. The a/p specifier can use lower, upper, or mixed case, and the result is displayed accordingly.
ampm	Uses the 12-hour clock for the preceding h or hh specifier, and displays the contents of the TimeAMString global variable for any hour before noon, and the contents of the TimePMStringglobal variable for any hour after noon.
/	Displays the date separator character given by the DateSeparator global variable.
:	Displays the time separator character given by the TimeSeparator global variable.
'xx'/"xx"	Characters enclosed in single or double quotation marks are displayed as such, and do not affect formatting.