VTL - Time operators

Name	Symbol	Time_period	Component	Dataset
Period indicator	period_indicator	✔️	✔️	✔️
Fill time series	fill_time_series	N/A	N/A	❌
Flow to stock	flow_to_stock	N/A	N/A	✔️
Stock to flow	stock_to_flow	N/A	N/A	✔️
Time shift	timeshift	✔️	✔️	✔️
Time aggregation	time_agg	N/A	N/A	❌
Actual time	current_date	✔️	N/A	N/A
Subtract dates	datediff	❌	❌	❌
Add to date	dateadd	❌	❌	❌
Year of a date	year	❌	❌	❌
Month of a date	month	❌	❌	❌
Number of day within the year	dayofyear	❌	❌	❌
Number of day within the month	dayofmonth	❌	❌	❌
Convert days to years	daytoyear	❌	❌	❌
Convert days to months	daytomonth	❌	❌	❌
Convert duration in days	yeartoday	❌	❌	❌
Convert duration in months	yeartomonth	❌	❌	❌