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# LogiView

## Functions and Commands

| ## Date and Time
| The following functions are available to edit date and time information:
date | {DAT_VAR | STR_VAR}= date() or {DAT_VAR | STR_VAR}= date({STR_EXPR}) This function returns a string with the current date.
date_add | {DAT_VAR|STR_VAR}= date_add({DAT_EXPR},{DAT_EXPR}) This function is used to add two dates.
date_sub | {DAT_VAR|STR_VAR}= date_sub({DAT_EXPR},{DAT_EXPR}) This function is used to subtract two dates.
day_nr | {INT_VAR}= day_nr({DAT_EXPR}) This function returns the number "25569 + x" which corresponds to the forwarded date. Hence, the date 01.01.1970 is defined as 25569; for every further day "1" is added.
time | {STR_VAR}= time() This function returns a string with the current time. The time format corresponds to the common representation in DataView.
weekday | {INT_VAR}= weekday({DAT_EXPR}) This function returns the day of the week for a certain date. Monday is defined as "1", Sunday is defined as "7".
year_week | {INT_VAR}= year_week({DAT_EXPR}) This function returns the calender week for a date as a value from 0 to 53. "Monday" is considered as the first day of the week.